WO2007148662A1 - 情報埋込装置、及び検出装置 - Google Patents
情報埋込装置、及び検出装置 Download PDFInfo
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- WO2007148662A1 WO2007148662A1 PCT/JP2007/062260 JP2007062260W WO2007148662A1 WO 2007148662 A1 WO2007148662 A1 WO 2007148662A1 JP 2007062260 W JP2007062260 W JP 2007062260W WO 2007148662 A1 WO2007148662 A1 WO 2007148662A1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
- H04N21/83—Generation or processing of protective or descriptive data associated with content; Content structuring
- H04N21/835—Generation of protective data, e.g. certificates
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- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
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- H04N1/387—Composing, repositioning or otherwise geometrically modifying originals
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- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
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- H04N21/25—Management operations performed by the server for facilitating the content distribution or administrating data related to end-users or client devices, e.g. end-user or client device authentication, learning user preferences for recommending movies
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- H04N21/45—Management operations performed by the client for facilitating the reception of or the interaction with the content or administrating data related to the end-user or to the client device itself, e.g. learning user preferences for recommending movies, resolving scheduling conflicts
- H04N21/462—Content or additional data management, e.g. creating a master electronic program guide from data received from the Internet and a Head-end, controlling the complexity of a video stream by scaling the resolution or bit-rate based on the client capabilities
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- H04N5/00—Details of television systems
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- G06T2201/0065—Extraction of an embedded watermark; Reliable detection
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- H04N5/91—Television signal processing therefor
- H04N5/913—Television signal processing therefor for scrambling ; for copy protection
- H04N2005/91307—Television signal processing therefor for scrambling ; for copy protection by adding a copy protection signal to the video signal
- H04N2005/91335—Television signal processing therefor for scrambling ; for copy protection by adding a copy protection signal to the video signal the copy protection signal being a watermark
Definitions
- the present invention relates to technology for preventing unauthorized copying of digital contents such as movies and music, and particularly to technology for preventing unauthorized copying using electronic transparency.
- a method using electronic transparency is known as a conventional technique for protecting a copyrighted work without permission from the copyright holder.
- a typical system that uses digital watermarks consists of a content provider's terminal (electronic transparency embedding device) and a content user's playback terminal (digital watermark detection device).
- the electronic watermark embedding device has a mechanism for embedding copyright information etc. in the content and recording it on a recording medium such as a disk.
- the playback terminal digital watermark detection device
- the playback terminal on the user side records it on the recording medium.
- Patent Document 1 discloses a technique for preventing unauthorized copying by embedding copy control information in content using an electronic watermark technique.
- camcorders digital video cameras
- a recording medium for example, an optical disk such as a DVD or an SD memory card
- a playback terminal for example, a DVD recorder
- Patent Document 1 U.S. Pat.No. 5,943,422
- Patent Document 2 Japanese Patent Laid-Open No. 9-191394
- Patent Document 3 JP-A-9 191395
- the movie of the child's favorite movie is played on the playback terminal and the state of the birthday party is recorded with a camcorder.
- the video information recorded on the recording medium with the camcorder includes the video and audio of the children, as well as the audio information of the movie. It will be recorded. If the recording medium on which the video information recorded in this way is recorded is applied to the playback terminal, the above-described mechanism determines that the copy is illegal and stops playback.
- the present invention provides an information embedding device, a detection device, an information embedding method, and a detection method capable of preventing the reproduction stop of content that has been captured without fraud.
- the purpose is to provide.
- the present invention provides an information embedding device for embedding a plurality of watermarks in a content along a reproduction time axis of the content.
- the acquisition means for acquiring the content played along the axis, and the plurality of transparent information, the value held in each watermark information has the first regularity according to the order of arrangement on the playback time axis.
- the transparency information generating means for generating in a changing manner and the watermark information of two or more of the plurality of watermark information are each in a state in which the arrangement order on the reproduction time axis is maintained.
- embedding means for embedding in the content.
- the information embedding device has at least two pieces of transparent information on the reproduction time axis among the plurality of transparent information generated by the watermark information generating means. Embed them in the content side by side.
- original content content
- the apparatus that plays back the recorded content sequentially detects the embedded transparency information during playback of the recorded content, and the order of the two or more detected transparency information is the first. It can be determined whether or not the content being played is illegally recorded based on whether or not the power is changing with regularity.
- the embedding unit determines whether the content has a predetermined length on the playback time axis.
- the watermark information may be embedded in each block satisfying a predetermined condition.
- the information embedding device embeds information by transmitting power for each block satisfying a predetermined condition.
- the device that is playing back the recorded content is playing back the recorded content.
- the value indicated by the transparent frame blue information is a counter value
- the watermark information generation means generates the plurality of counter values by a counter
- the embedding means generates the value You can embed the counter value.
- the information embedding device embeds a counter value as information.
- a content in which two or more counter values are embedded is recorded by a camcorder or the like during playback, the device that is playing back the recorded content is in the middle of playing back the recorded content.
- the counter value was detected in block units, and the recorded content was illegally recorded depending on whether the detected one or more force counter values changed with the first regularity. It can be judged whether it is a thing.
- the content includes an audio part including audio data
- the predetermined condition is that the block has an information amount for embedding a counter value
- the embedding unit includes:
- the audio unit may be divided into the two or more blocks, and the counter value may be embedded in a block having an information amount for embedding the counter value.
- the information embedding device sequentially embeds the force value in the audio portion of the original content.
- the device that plays back the recorded content also detects the counter value for the audio data power in units of blocks. It is possible to determine whether one or more detected counter values have changed with the first regularity.
- the embedding unit generates the counter value for each divided block. However, it controls the information generation means, receives counter values corresponding to each block from the watermark information generation means, and if the embedding target block does not have the information amount for embedding the corresponding counter value, The counter value corresponding to the block may be discarded.
- the embedding unit controls the watermark information generating unit so as to suppress generation of a counter value for the block when the divided block does not have an information amount for embedding the counter value.
- the information embedding device does not embed watermark information in a block that does not have an information amount for embedding information in the audio part of the original content. Can be.
- each divided block has a sub-block having a predetermined number of forces
- the embedding means counters each sub-block included in the block when embedding information by permeable to the block.
- the value may be embedded.
- the information embedding device embeds a counter value in each sub-block included in the block.
- the device that plays back the recorded content should In some sub-blocks, the counter value cannot be detected for some reason, or even if it is detected incorrectly, the same counter value can be detected from other sub-blocks in the same block.
- the same counter value can be detected from other sub-blocks in the same block.
- Judgment can be made.
- the transparent watermark blue generation means may sequentially calculate a monotonically increasing counter value.
- the information embedding device since the information embedding device generates the counter value so as to increase monotonously, the device for reproducing the content in which the content in which two or more counter values are embedded by a camcorder or the like is recorded is Whether or not the content being played back is an illegally recorded content is judged by whether or not one or more detected counter values are monotonously increasing be able to.
- the watermark information generating means may sequentially calculate a counter value that monotonously increases or decreases every predetermined cycle.
- the information embedding device generates the counter value so as to periodically circulate. Therefore, the information embedding device can reproduce the content in which the content in which two or more counter values are embedded by a camcorder or the like is recorded. Based on whether or not one or more detected counter values circulate periodically, it can be determined whether or not the content being reproduced is an illegally recorded content.
- a counter with a limited range of values that can be used as a counter value (for example, a 4-bit counter that can sequentially output 1 to 16) is used as watermark information generation means. It is possible to configure the transparent blueprint generating means at a low cost.
- the content has a video part including continuous video data, and the embedding means divides the video part into the two or more blocks, and embeds a counter value in the divided blocks.
- the counter value may be embedded in at least one frame having the amount of information.
- the information embedding device transparently embeds information sequentially in the video portion of the content in which one or more counter values are embedded.
- a device that plays back content recorded with content with two or more counter values embedded by a camcorder or the like detects information by transmitting video data power in units of blocks during playback of the recorded content. Then, it can be judged whether or not the detected one or more counter values are changing with the first regularity.
- the content includes one or more frames
- the information embedding device is further adapted to embed information by the embedding unit being transparent to each frame to be embedded.
- Generating position information for each frame to be embedded which indicates the position to be embedded with respect to the watermark information to be embedded and changes with the second regularity according to the arrangement order on the reproduction time axis
- the embedding means when embedding the permeability information of the embedding object in the frame to be embedding, the position indicated by the position information generated for the frame. It is also possible to embed the see-through f blueprint.
- the information embedding device embeds each piece of watermark information based on the corresponding position information.
- a device that reproduces content recorded with two or more transparent and embedded information by a camcorder or the like can detect the single transparent information detected during the reproduction of the recorded content. Since both the first regularity confirmation for the image and the second regularity confirmation for the embedding position based on the position information can be performed, it is possible to enhance prevention against illegal recording.
- the information embedding device further indicates the strength when embedding the watermark to be embedded on the reproduction time axis, and follows the arrangement order on the reproduction time axis.
- Intensity information generating means for generating, for each of the plurality of watermark information, intensity information that changes with a third regularity, and the embedding means further responds when embedding the watermark information.
- the watermark information may be embedded with the strength indicated by the strength information.
- the information embedding device further embeds each piece of information with the corresponding strength and strength.
- a device that reproduces content recorded with two or more transparent and embedded information by a camcorder or the like can further confirm the third regularity with respect to the strength.
- the prevention against recording can be further strengthened.
- the information embedding device further indicates a strength when embedding permeability information for each of the plurality of watermark information, and a second rule according to an arrangement order on the reproduction time axis.
- Intensity information generating means for generating intensity information that changes with the embedding means, and the embedding means embeds the permeability information at the intensity indicated by the corresponding intensity information when embedding the watermark information. Also good.
- the information embedding device embeds the transparent information based on the corresponding strength.
- a device that plays back content recorded with content embedded with two or more pieces of transparency information by a camcorder or the like is the first rule for transparent watermarks during playback of the recorded content. Since it is possible to perform both confirmation of the security and the second regularity with respect to the strength with which information is embedded, the prevention against illegal recording can be strengthened.
- the present invention also provides a first content generated by the information embedding device according to claim 1.
- the second content power including at least a part of the first content is a detection device that detects unauthorized use of the first content, and the watermark information embedded in the first content is extracted from the second content.
- the detection means to detect, the value held by each of the one or more watermarks detected in the past, and the value held by the permeability information detected this time are arranged in the order in which they are arranged on the playback time axis.
- a first determination means for determining whether or not the first regularity is complied with, and if the first determination means determines that the first regularity is satisfied, the first detection means is detected in the past.
- the second total number is used to determine whether or not the first total number indicating the total number of the one or more pieces of permeability information and the currently detected watermark is not less than a first threshold value.
- a determination means, and the second determination means determines that the first total number is greater than or equal to the first threshold value. If that Ru is characterized by comprising a reproduction control means for reproducing on the second content control the the reproduction so as not to operate normally.
- the detection device illegally records the second content being played back based on the first total number of watermark information satisfying the first regularity along the playback time axis. It is possible to determine whether or not the product is normal.
- the first total number of permeability information satisfying the first regularity is confirmed to be greater than or equal to the first threshold.
- the original content is played back at a birthday party, etc., if it happens to be shot (recorded) unintentionally and discontinuously by a camcorder, etc., the recorded second content Even if two or more pieces of watermark information are detected during playback, it is not confirmed that the first total number of transparent information satisfying the first regularity is not less than the first threshold value.
- the detection device When determining that the second content is the first content in which the second content is illegally recorded, the detection device performs control so that reproduction of the recorded second content does not operate normally. It is possible to eliminate the second content that was recorded illegally.
- the detection means converts the second content into two or more pieces having the predetermined strength. Dividing into reproduction blocks, the presence or absence of the permeability information may be detected from each of the divided reproduction blocks.
- the detecting device divides the second content into playback blocks having a predetermined strength during playback of the second content, and detects the presence or absence of watermark information for each divided playback block.
- the detecting device divides the second content into playback blocks having a predetermined strength during playback of the second content, and detects the presence or absence of watermark information for each divided playback block.
- the value held in the transparent frame blue information is a counter value calculated by a counter
- the detection means detects the presence or absence of the counter value from each of the divided reproduction blocks
- the determination means 1 may determine whether the force satisfies a rule based on a counter value detected in the past, a counter value detected this time, and a force count.
- the detection device detects the counter value embedded as information and identifies the first regularity for each counter value in the detection order during the reproduction of the second content. can do.
- the one or more counter values are embedded in an original audio part made of audio data included in the first content, and the second content is stored in the original audio part.
- the detecting device detects the presence or absence of the counter value sequentially embedded in the audio part of the first content during the reproduction of the second content, and detects the detected two It is possible to determine whether or not the first regularity against the counter value is confirmed.
- the second determination means includes a comparison value storage unit that stores a comparison value for comparison with the counter value, an update unit that updates the comparison value at a predetermined period, and the counter.
- a coincidence number storage unit for storing a coincidence number indicating the number of coincidence between the value and the comparison value, the counter value is compared with the comparison value, and the counter value and the comparison value are matched according to a comparison result.
- the determination unit and the comparison unit are continuously connected with the comparison unit until the detection of the transparent information by the detection unit is completed or until the reproduction control unit controls an operation related to reproduction of the second content.
- a repeat control unit that controls to repeat the operation with the sex determination unit, and the reproduction control unit determines that the number of matches exceeds the first threshold value by the continuity determination unit.
- the playback may be controlled so that the playback of the second content does not operate normally.
- the detection device compares the comparison value with the detected counter value, and if they match, updates the number of matches, and determines whether the number of matches exceeds the first threshold. To do.
- the second content may determine that the first content has been illegally recorded. it can.
- the comparison unit determines that the counter value does not match the comparison value based on the comparison result, the comparison value stored in the comparison value storage unit and the number of coincidence It is also possible to reset each of the number of matches stored in the storage unit to the initial value.
- the detection device when the comparison value does not match the detected counter value, the detection device resets each of the comparison value and the number of matches to the initial value.
- the detected counter value and the comparison value do not match, and each of the comparison value and the number of matches is reset to the initial value.
- the content captured as such is illegally recorded. It is not determined to have been made.
- the second determination means further includes a mismatch number storage unit for storing a mismatch number indicating the number of times the counter value and the comparison value do not match, and the mismatch number is a predetermined value.
- the mismatch number storage unit stores A reset unit that resets the number of matches to an initial value, and the comparison unit If it is determined that the counter value does not match the comparison value according to the comparison result, the comparison value stored in the comparison value storage unit is reset to the initial value.
- the detection device determines that the number of mismatches exceeds a predetermined threshold
- the number of matches is reset to an initial value.
- the camcorder illegally shot (illegally recorded), and the number of times less than the predetermined threshold was shot discontinuously.
- the coincidence number storage unit stores it. As a result of not resetting the number of matches, in such a case, it can be determined that the second content has been recorded illegally.
- the second determination means further includes the comparison value stored in the comparison value storage unit when reproduction of the second content is stopped or paused, and A reset unit may be provided that resets each of the number of matches stored in the number-of-matches storage unit to an initial value.
- the detection device when the reproduction of the second content is stopped or paused, the detection device resets the number of matches to the initial value. As a result, the detection device can reduce the chance that the second content that has not been illegally recorded is judged to have been illegally recorded.
- the one or more counter values are embedded in an original video portion made of video data included in the first content, and the second content is at least one of the original video portions.
- a reproduction video unit including a reproduction unit, wherein the detection means divides the reproduction video unit into the two or more reproduction blocks and detects the presence or absence of a counter value for each divided reproduction block. Good.
- the detection device detects and detects the presence or absence of the counter value sequentially embedded in the original audio part of the first content during playback of the second content. It is possible to determine whether or not the first regularity for more than one counter value is confirmed.
- the first content includes a plurality of original frames, and each of the plurality of pieces of transparent information is a second in accordance with an arrangement order on the reproduction time axis for each of the original frames to be embedded.
- the second content includes a plurality of playback frames, at least one of the playback frames includes the original frame, and the detection means includes: Further, when the frame force of the detection target also detects the transparent information, the detected position information indicating the position where the detected transparent information is embedded is obtained, and the first determination means further detects the past. It is determined whether or not the detected position information corresponding to each of the one or more transparent information and the detected position information corresponding to the currently detected transparent information satisfy the second regularity. The second determining means further determines each of the one or more transparent information detected in the past when the first determining means determines that the second rule is satisfied.
- the regeneration control means is configured such that when the second judgment means judges that the first total number is equal to or larger than a first threshold, and the second total number is equal to or larger than a second threshold. Only when it is determined that there is, the playback is controlled so that the playback for the second content does not operate normally.
- the detection device can confirm the first regularity with respect to the watermark blue and the second regularity with respect to the embedding position based on the detected position information during the reproduction of the second content. By doing both, it is possible to reinforce the judgment as to whether or not the second content has been illegally recorded.
- each of the plurality of pieces of permeability information is embedded based on an intensity that changes with a third regularity according to the order of arrangement on the reproduction time axis, and the detection means further includes a detection target.
- the detection means further includes a detection target.
- the detected strength information indicating the embedding strength of the detected watermark F blue information is acquired
- the first determination means further detects one piece detected in the past. It is determined whether or not the detected intensity information corresponding to each of the above-described permeability information and the detected intensity information corresponding to the watermark information detected this time satisfies the third rule, and the second determining means Further, the third rule is determined by the first determination means.
- the reproduction control means determines whether the first total number is greater than or equal to the first threshold by the second determination means. Only if the second total number is determined to be greater than or equal to the second threshold and if the third total number is determined to be greater than or equal to the third threshold. The playback is controlled so that the playback for the second content does not operate normally.
- the detection apparatus since the detection apparatus further checks the third regularity with respect to the strength of the embedded transparent information during the reproduction of the second content, the second content is not valid. It is possible to reinforce the judgment as to whether or not it is recorded correctly.
- each of the plurality of pieces of permeability information is embedded based on an intensity that changes with a second regularity in accordance with the arrangement order on the reproduction time axis, and the detection means further includes a detection target.
- the detected intensity information indicating the intensity with which the detected watermark is embedded is acquired, and the first determination means further detects in the past. It is determined whether or not the detected intensity information corresponding to each of the one or more transparent marks and the detected intensity information corresponding to the detected transparent information satisfies the second rule.
- the second determination unit further corresponds to each of the one or more pieces of watermark information detected in the past when the first determination unit determines that the second rule is satisfied.
- Detection strength information to be detected and the detection strength corresponding to the previously detected transparency information Determining whether or not the second total number indicating the total number of information is equal to or greater than a second threshold, and the regeneration control means determines whether the first total number is the second determination means. Only when it is determined that the value is equal to or greater than the first threshold value, and when the second total number is determined to be equal to or greater than the second threshold value, reproduction with respect to the second content does not operate normally. You may want to control the playback.
- the detection device checks the first regularity with respect to the watermark blue information and reproduces the second strength with respect to the strength of the embedded watermark information during the reproduction of the second content. This is to confirm both the regularity and whether or not the second content is illegally recorded. Judgment can be strengthened.
- FIG. 1 is a diagram showing an outline of the configuration of an electronic permeability embedded Z detection system 1.
- FIG. 2 is a block diagram showing a configuration of an electronic permeability embedding device 10 and a recording medium 20.
- FIG. 3 is a diagram showing an example of embedding target digital content before and after embedding watermark information.
- FIG. 4 is a block diagram showing the configuration of the digital watermark detection apparatus 30.
- FIG. 5 is a block diagram showing a configuration of a determination unit 306.
- FIG. 6 is a flowchart showing the operation of the electronic permeability embedding device 10.
- FIG. 7 is a flowchart showing the operation of the embedding process performed by the electronic permeability embedding apparatus 10.
- FIG. 8 is a flowchart showing the operation of playback control processing performed by the digital watermark detection apparatus 30.
- FIG. 9 is a flowchart showing the operation of determination processing performed in the digital watermark detection apparatus 30. Continue to Figure 10.
- FIG. 10 is a flowchart showing the operation of determination processing performed in the digital watermark detection apparatus 30. Continue from Figure 9.
- FIG. 11 is a diagram showing an outline of the configuration of an LSI that realizes an electronic permeability embedding function.
- FIG. 12 is a diagram showing an example of a data structure after embedding information in digital content to be embedded.
- FIG. 13 is a diagram showing an example of the data structure after embedding information in digital content to be embedded.
- FIG. 14 is a diagram showing an example of embedding information in a video block based on position information.
- Digital watermark embedding unit Content encryption unit Content key storage unit
- Device key storage unit Content key encryption unit Output unit
- Cryptographic content storage area Cryptographic content key storage area Input section
- the electronic permeability embedding Z detection system 1 includes an electronic permeability embedding device io, a recording medium 20 and a digital watermark detection device 30 shown in FIG.
- the digital watermark embedding device 10 embeds information by embedding a digital watermark into the content to be embedded with the digital watermark, and encrypts the content embedded with the information.
- the digital watermark embedding device 10 records the encrypted content on the recording medium 20.
- the content is composed of an audio unit having audio data power and a video unit having video data power.
- the permeability information will be described later.
- the recording medium 20 records the encrypted content. It is assumed that the encrypted content recorded on the recording medium 20 is subjected to copy control and cannot be copied to another recording medium in an encrypted state.
- the recording medium 21 reproduces the encrypted content recorded on the recording medium 20 and illegally records video and audio output from a monitor or the like by a camcorder or the like.
- illegal recording the illegal recording of video and audio that has also been output by a monitor or the like on a recording medium with a camcorder or the like will be referred to as illegal recording.
- video and audio recorded on a recording medium by unauthorized recording are referred to as unauthorized content.
- video and audio output from a monitor or the like are recorded on the recording medium 21 by a camcorder or the like, so that the unauthorized content recorded on the recording medium 21 is encrypted! ! /
- the recording medium 22 is a content in which the encrypted content is reproduced and the video and audio of the content are recorded together with other video and audio by the camcorder, for example, the state of the birthday party is recorded. ing. Thereafter, the encrypted code recorded on the recording medium 20 is recorded. Recording other video and audio (for example, a birthday party) while playing the content is called legitimate recording. In addition, content recorded by legitimate recording is called video content. Note that the video content is not encrypted.
- video content and unauthorized content are collectively referred to as recorded content.
- recorded content video content and unauthorized content are collectively referred to as recorded content.
- the encrypted content and the recorded content are encoded and compressed by encoding. Since encoding is a known technique, its description is omitted.
- the digital watermark detection apparatus 30 reads the content (either the encrypted content or the recorded content) with the attached recording medium power. If the read content is encrypted content, the digital watermark detection device 30 performs reproduction without detecting watermark information. If the read content is a recorded content, the electronic watermark detection device 30 also detects the information by detecting the recorded content force, and controls the reproduction of the recorded content based on the detected information.
- the digital watermark embedding apparatus 10 includes a content storage unit 101, an embedded information generation unit 102, a digital watermark embedding unit 103, a content encryption unit 104, a content key storage unit 105, and a device.
- the key storage unit 106, the content key encryption unit 107, the output unit 108, the decoding unit 109, and the encoding unit 110 are included.
- the digital watermark embedding device 10 is also configured with power such as a microprocessor, RAM, ROM, and a hard disk.
- power such as a microprocessor, RAM, ROM, and a hard disk.
- a computer program is stored in the RAM, ROM, and hard disk, and the electronic permeability embedding device 10 fulfills its function when the microprocessor operates according to the program.
- the content storage unit 101 stores digital content to be embedded with information. is doing.
- the content stored in the content storage unit 101 is code-compressed.
- the decoding unit 109 reads the original content from the content storage unit 101.
- the read content is decoded and D / A converted (digital to analog conversion), and content composed of analog data (hereinafter also referred to as analog content) is output to the electronic permeability embedding unit 103.
- the embedding information generation unit 102 When the embedding information generation unit 102 receives a transparent information generation command indicating that the watermark information is generated from the electronic permeability embedding unit 103, the embedding information generation unit 102 uses the counter value as the permeation information for embedding in the analog content. Is generated.
- the embedding information generation unit 102 outputs the generated counter value to the digital watermark embedding unit 103.
- the initial value of the counter value is set to 0, and the embedded information generating unit 102 adds 1 to the counter value every time a transparent information is received from the digital watermark embedding unit 103 and an information generation command is received.
- the result is updated as a new counter value, and the addition result (updated counter value) is electronically transmitted to the embedding unit 103.
- the electronically permeable embedding unit 103 receives analog content from the decoding unit 109 and separates the received content into an audio unit and a video unit.
- the electronically transparent embedding unit 103 further divides the separated audio part into unit blocks (hereinafter simply referred to as “blocks”) that are digital watermark detection units.
- the digital watermark detection unit is, for example, 10 seconds
- the digital watermark embedding unit 103 divides the audio part into 10-second playback times.
- the electronic permeability embedding unit 103 embeds permeability information for each block by the following operation. First, when the electronic permeability embedding unit 103 obtains a block located at the head of the audio unit, it outputs a watermark information generation command to the embedded information generation unit 102 and outputs a counter value from the embedded information generation unit 102. receive.
- the electronic permeability embedding unit 103 determines whether or not there is sufficient power to embed the received permeability information in the acquired block, that is, whether there is enough information to embed the information. To do. For example, the digital watermark embedding unit 103 determines whether the acquired block consists of only the silent part, or whether the ratio of the acquired block that includes the silent part is equal to or higher than a predetermined ratio (for example, 70%). If it is determined that the acquired block is a silent part or that the silent part is included in a predetermined ratio or more, it is determined that there is not enough information to embed the transparent blueprint. If the result is other than that, it is judged that there is enough information to embed information.
- the silent part is a part where no sound is present.
- a block that also has a silent part force, or a block that includes a silent part with a predetermined ratio (for example, 70%) or more is referred to as a silent block.
- the digital watermark embedding unit 103 embeds the received counter value in the acquired block. If it is determined that the information cannot be embedded, the digital watermark embedding unit 103 discards the received counter value and stops embedding in the block. In addition, since it is a well-known technique about embedding
- the electronic permeability embedding unit 103 determines whether there is a block positioned next. When it is determined that there is a next block, the electronic permeability and embedding unit 103 acquires the next block and performs the above operation. When it is determined that there is no next block, the electronically permeable embedding unit 103 outputs the post-embedding analog content consisting of the separated video unit and the audio unit subjected to the above operation to the encoding unit 110. To do.
- watermark information is embedded as noise in audio data.
- Figure 3 shows a specific example before and after embedding the watermark.
- the electronic permeability embedding unit 103 divides the audio part B10 into blocks Bl l, B12, B13, B14, B15,... Of the digital watermark detection unit (10 seconds unit).
- the blocks B13 and B14 are silent blocks, and the other blocks Bl1, B12, B15,... Are not silent blocks, that is, have a sound blocking force.
- the embedded information generating unit 102 sequentially generates a counter value for each divided block.
- the electronic permeability embedding unit 103 determines whether or not the counter value generated for each block can be embedded.
- the electronic permeability embedding unit 103 embeds a counter value corresponding to the block to be embedded.
- the digital watermark embedding unit 103 When determining that embedding is not possible, the digital watermark embedding unit 103 does not embed a counter value corresponding to the block to be embedded.
- the electronic permeability embedding unit 103 can generate the audio part B20 including the permeability information.
- the audio unit B20 has blocks B23 and B24 in which the counter value is not embedded in the silence blocks B13 and B14, and blocks B1, B12, and B15 that are not silence blocks.
- This counter value (“0x0001”, “0x0002”, “0x0 005", ..., "0x0959”, “0x0960”) is composed of embedded blocks B21, B22, B25, ... Has been.
- Encoding unit 110 when the electronic Toruryoku by embedding unit 103 receives the information embedded after analog contency Tsu, received AZD converted to the content (analog to digital conversi o n) and subjected to encoding content encoded I spoon compression (Hereinafter referred to as digital content after embedding information).
- Encoding section 110 outputs the generated content to content encryption section 104.
- the content key storage unit 105 stores key information (content key) for encrypting the content.
- the content encryption unit 104 When the content encryption unit 104 receives the digital content after the information is embedded from the encoding unit 110, the content encryption unit 104 acquires the content key stored in the content key storage unit 105.
- the content encryption unit 104 encrypts the received content with the acquired content key and generates encrypted content.
- the content encryption unit 104 writes the generated encrypted content into the encrypted content storage area 201 of the recording medium 20 via the output unit 108.
- DES encryption or AES encryption is used for encrypting the content on the recording medium. Since these encryption techniques are well-known techniques, description thereof is omitted.
- the device key storage unit 106 stores key information (device key) for encrypting the content key.
- the content key encryption unit 107 acquires a content key from the content key storage unit 105 and a device key from the device key storage unit 106.
- the content key encryption unit 107 encrypts the content key acquired from the content key storage unit 105 with the device key acquired from the device key storage unit 106, and generates an encrypted content key.
- the content key encryption unit 107 writes the generated encrypted content key in the encryption key content key storage area 202 of the recording medium 20 via the output unit 108.
- the output unit 108 stores the encrypted content generated by the content encryption unit 104 and the encrypted content key generated by the content key encryption unit 107 in the encrypted content of the recording medium 20. Recorded in the area 201 and the encrypted content key storage area 202.
- the digital watermark detection apparatus 30 includes an input unit 301, a device key storage unit 302, a content key decryption unit 303, a content decryption unit 304, a digital watermark detection unit 305, a determination unit 306, a control unit 307, an output A unit 308, an identification processing unit 309, and a decoding unit 310 are configured.
- the digital watermark detection device 30 is also configured with power such as a microprocessor, RAM, ROM, and a hard disk.
- power such as a microprocessor, RAM, ROM, and a hard disk.
- a computer program is stored in the RAM, ROM, and hard disk, and the digital watermark detection device 30 performs its function when the microprocessor operates according to the program.
- the identification processing unit 309 determines whether or not the encrypted content is recorded on the attached recording medium. As an example of the determination method, for example, the identification processing unit 309 determines whether or not the encrypted content key exists in the attached recording medium.
- the identification processing unit 309 stores the encrypted content of the recording medium 20 via the input unit 301.
- the encrypted content and the encrypted content key are read from the area 201 and the encrypted content key storage area 202, respectively.
- the identification processing unit 309 outputs the read encrypted content to the content decryption unit 304, and outputs the read encrypted content key to the content key decryption unit 303.
- the attached recording medium power is also recorded via the input unit 301 (the unauthorized content and the unauthorized content). Any one of the video contents) is read, and the read recording content and a detection instruction to detect the detected information are output to the decoding unit 310.
- the identification processing unit 309 may determine whether or not the encrypted content key storage area exists in the mounted recording medium.
- the input unit 301 reads data from the attached recording medium, and outputs the read data to the identification processing unit 309.
- the device key storage unit 302 stores key information (device key) for decrypting the encrypted content key.
- the content key decryption unit 303 receives the encrypted content key from the identification processing unit 309.
- the content key decryption unit 303 acquires the device key stored in the device key storage unit 302.
- the content key decryption unit 303 decrypts the encrypted content key using the device key to generate a content key, and outputs the generated content key to the content decryption unit 304.
- the content decryption unit 304 receives the encrypted content from the identification processing unit 309.
- the content decryption unit 304 decrypts the encrypted content using the received content key and generates digital content after embedding information.
- the content decrypting unit 304 outputs the generated post-information embedded digital content to the decoding unit 310.
- the decoding unit 310 Upon receiving the detection instruction and the recorded content (either illegal content or video content) from the identification processing unit 309, the decoding unit 310 performs decoding and DZA conversion on the received recorded content to generate analog content. . The decoding unit 310 outputs the analog content to the digital watermark detection unit 305 and the control unit 307.
- decoding unit 310 When receiving the digital content after information embedding from content decoding unit 304, decoding unit 310 outputs reproduction execution information for executing reproduction to control unit 307. Then receive After embedding information, the digital content is decoded and DZA converted to generate analog content, and the generated analog content is output to the control unit 307.
- the digital watermark detection unit 305 When receiving the analog content from the decoding unit 310, the digital watermark detection unit 305 separates the received content into an audio unit and a video unit.
- Digital watermark detection section 305 further divides the separated audio section into blocks that are watermark detection units.
- the digital watermark detection unit 305 detects permeability information (counter value) for each divided block, and outputs the detected transparency information to the determination unit 306. If the block is a silent block, it is transparent and no information is detected.
- the determination unit 306 sequentially receives the detected watermark information from the digital watermark detection unit 305.
- the determination unit 306 determines whether or not the content is permitted to be reproduced based on the received one or more pieces of permeability information.
- the determination unit 306 When determining that the content is not permitted to be reproduced, the determination unit 306 outputs reproduction stop information indicating that reproduction is stopped to the control unit 307, and determines that reproduction is permitted. Notifies the control unit 307 of reproduction continuation information indicating that reproduction is to be continued.
- the control unit 307 has a switch for connecting or disconnecting between the decoding unit 310 and the output unit 308, and controls content reproduction based on the information output from the decoding unit 310 and the determination result of the determination unit 306.
- the initial state of the switch is a state where the decoding unit 310 and the output unit 308 are connected (hereinafter referred to as the ON state).
- control unit 307 When receiving the reproduction execution information from the decoding unit 310, the control unit 307 always turns on the switch, receives the analog content received from the decoding unit 310, and outputs the received content to the output unit 308. When receiving the determination result from determination unit 306, control unit 307 performs the following operation in accordance with the received determination result.
- control unit 307 sets the switch state to ON and outputs the content to be reproduced to the output unit 308.
- the control unit 307 opens the switch so that the decoding unit 310 and the output unit 308 are disconnected (hereinafter referred to as an OFF state). Stop playing content.
- the output unit 308 When the output unit 308 receives content to be reproduced from the decoding unit 310 via the control unit 307, the output unit 308 outputs the received content to a display device such as a display.
- the determination unit 306 includes a comparison value storage unit 351, a comparison unit 352, an update unit 353, a comparison result processing unit 354, a determination result output unit 355, a reception unit 356, and a comparison result storage unit 357. Composed.
- the comparison value storage unit 351 stores an initial value (for example, “0x0000”) as a comparison value.
- the comparison value storage unit 351 stores the stored comparison value in the permeability information (counter value) received from the digital watermark detection unit 305 via the reception unit 356.
- the comparison value storage unit 351 updates the stored comparison value to the comparison value updated by the updating unit 353 at a predetermined timing.
- the first block force is also stored in the comparison value storage unit 351 as a comparative value. Is done.
- the update unit 353 updates the it comparison value 315 of the comparison value description “351” to “0x0002”.
- the reception unit 356 receives the permeability information received from the digital watermark detection unit 305.
- the receiving unit 356 determines whether or not the value in the comparison value storage unit 351 is an initial value. When it is determined that the value is the initial value, the accepting unit 356 starts the operation with respect to the updating unit 353. A start instruction is output to indicate that the stored value is received, and the stored value is updated to the transmitted information. Thereafter, the reception unit 356 outputs the received permeability information to the comparison unit 352.
- the reception unit 356 When it is determined that the initial value is not !, the reception unit 356 outputs the received permeability information to the comparison unit 352.
- the comparison unit 352 receives the permeability information received from the digital watermark detection unit 305.
- the comparison unit 352 compares whether or not the permeability information received from the digital watermark detection unit 305 matches the comparison value stored in the comparison value storage unit 351.
- the comparison unit 352 If the comparison results in a match, the comparison unit 352 notifies the comparison result processing unit 354 of matching information indicating that fact. Also, if they do not match, the comparison unit 352 resets the comparison value stored in the comparison value storage unit 351 (for example, changes to “0x0000”), and the comparison result stored in the comparison result storage unit 357 stores the comparison value. The number of matches indicating the number of matches when it is determined to match is also reset (eg, changed to “0”). Furthermore, the comparison unit 352 outputs a stop instruction to the update unit 353 to stop updating the value stored in the comparison value storage unit 351 by the update unit 353.
- the updating unit 353 updates the value in the comparison value storage unit 351 according to a predetermined timing.
- the block in which the electronic permeability is embedded is divided every 10 seconds, so the value of the comparison value storage unit 351 is updated every 10 seconds.
- the update unit 353 When the update unit 353 receives a start instruction from the reception unit 356, the update unit 353 starts an operation related to the update, that is, time measurement.
- Update unit 353 updates the value in comparison value storage unit 351 when it detects the elapse of a predetermined time.
- the updating unit 353 acquires the comparison value stored in the comparison value storage unit 351, adds 1 to the acquired comparison value, and stores the comparison value stored in the comparison value storage unit 351. Update to.
- the updating unit 353 When the updating unit 353 receives a stop instruction from the comparing unit 352, the updating unit 353 stops the operation related to the update, that is, the time measurement.
- Comparison result storage unit 357 has an area for storing the number of matches.
- the comparison result processing unit 354 stores in advance a predetermined value (for example, 100) serving as a criterion for determining whether or not to stop the output of content.
- the comparison result processing unit 354 When the comparison result processing unit 354 receives the match information from the comparison unit 352, the comparison result processing unit 354 updates the number of matches stored in the comparison result storage unit 357 to a result obtained by adding 1 to the number of matches. The comparison result processing unit 354 determines whether or not the number of matches stored in the comparison result storage unit 357 is a predetermined value or more.
- the comparison result processing unit 354 When determining that the number of matches is equal to or greater than the predetermined value, the comparison result processing unit 354 generates the match count excess information indicating that, and outputs (notifies) the generated match count excess information to the determination result output unit 355. To do.
- the comparison result processing unit 354 When it is determined that the number of matches is not more than a predetermined value !, the comparison result processing unit 354 generates the match count non-exceeded information indicating that and outputs the generated match count non-exceeded information. Output (notify) to the power unit 355.
- the comparison result processing unit 354 notifies the determination result output unit 355 of the number of times of matching number excess information. .
- the determination result output unit 355 Upon receiving the number-of-matches excess information from the comparison result processing unit 354, the determination result output unit 355 generates reproduction stop information and notifies the control unit 307 of the generated reproduction stop information.
- the determination result output unit 355 When the determination result output unit 355 receives the number-of-matches excess information from the comparison result processing unit 354, the determination result output unit 355 generates the reproduction continuation information and notifies the control unit 307 of the generated reproduction continuation information.
- the decoding unit 109 of the digital watermark embedding device 10 reads the content from the content storage unit 101, and decodes the read content (step S5).
- Digital watermark embedding part 103 separates the content (analog content) decoded by the decoding unit 109 and DZA-converted into an audio unit and a video unit (step S10).
- the electronically transparent embedding unit 103 further divides the separated audio part into blocks of a digital watermark detection unit (step S 15).
- the digital watermark embedding device 10 is an analog content after information embedding in which at least one transparent information (counter value) is embedded by the embedding process by the embedding information generation unit 102 and the digital watermark embedding unit 103. Is generated (step S20).
- the encoding unit 110 encodes the analog content after information embedding generated by the embedding process (step S25).
- the content encryption unit 104 encrypts the content (digital content after information embedding) encoded by the encoding unit 110 with a content key to generate encrypted content (step S 30).
- the content key encryption unit 107 generates an encryption content key by encrypting the content key with the device key (step S35).
- the digital watermark embedding device 10 stores the generated encrypted content in the encrypted content storage area 201 of the recording medium 20 and the encrypted content key in the encrypted content key storage area 202 of the recording medium 20. Record each (step S40).
- step S20 will be described using the flowchart shown in FIG.
- the digital watermark embedding unit 103 acquires the first block of the audio unit (step S50).
- the digital watermark embedding unit 103 outputs a watermark information generation command to the embedded information generation unit 102.
- the embedded information generating unit 102 When receiving the information generation command from the digital watermark embedding unit 103, the embedded information generating unit 102 generates a counter value (step S55).
- Embedding information generating section 102 outputs the generated counter value to digital watermark embedding section 103.
- the digital watermark embedding unit 103 receives the counter value from the embedded information generating unit 102.
- the electronic permeability embedding unit 103 can embed the received transparency in the acquired block. It is determined whether or not it is a function (step S60).
- the electronic permeability embedding unit 103 embeds the received counter value in the acquired block (step S65). .
- the digital watermark embedding unit 103 determines whether or not there is a next block (step S70). If it is determined that there is a next block (“YES” in step S70), the digital watermark embedding unit 103 acquires the next block (step S75), and returns to step S55. If it is determined that there is no next block (“NO” in step S70), the electronic permeability embedding unit 103 outputs the analog content after information embedding to the encoding unit 110, and ends the embedding process.
- step S60 If it is determined that it is impossible to embed information by transparency (“NO” in step S60), the digital watermark embedding unit 103 performs the operations in and after step S70.
- the identification processing unit 309 determines whether or not the encrypted content is recorded on the attached recording medium (step S100).
- the digital watermark detection apparatus 30 ends the reproduction control process and performs the normal reproduction process (encrypted content). And decrypted content is played back unconditionally).
- the identification processing unit 309 receives the recording content (from the loaded recording medium via the input unit 301) ( Any one of illegal content and video content is read (step S105). The identification processing unit 309 outputs the read recorded content and a detection instruction indicating that the information is to be detected to the decoding unit 310.
- the decoding unit 310 Upon receiving the detection instruction and the recorded content from the identification processing unit 309, the decoding unit 310 decodes the received recording content and performs DZA conversion to generate an analog content (step S110). The decoding unit 310 converts analog content into a digital watermark detection unit. 305 and the control unit 307.
- the digital watermark detection unit 305 separates the analog content into an audio part and a video part (Step S115).
- Digital watermark detection section 305 further divides the separated audio section into blocks that are watermark detection units (step S120).
- the digital watermark detection unit 305 acquires the first block among the one or more divided blocks (step S 125).
- the digital watermark detection unit 305 also detects the permeability information (counter value) for the acquired block force, and outputs the detected permeability information to the determination unit 306 (step S130). Note that if the block is a silent block, it is transparent and no information is detected.
- the digital watermark detection unit 305 determines whether or not there is a next block (step S 135). If it is determined that it exists (“YES” in step S135), the digital watermark detection unit 305 acquires the next block (step S140), and returns to step S130. When determining that it does not exist (“NO” in step S135), the digital watermark detection unit 305 ends the watermark information detection process.
- step S130 the determination unit 306 performs a determination process (step S145).
- the control unit 307 determines whether or not to continue the reproduction based on the determination result by the determination process (step S150). Here, the control unit 307 determines whether the information received from the determination unit 306 is force regeneration stop information that is regeneration continuation information.
- step S150 When it is determined that the reproduction is not continued ("NO" in step S150), that is, when the reproduction stop information is received from the determination unit 306, the control unit 307 sets the switch state to the OFF state. Then, the content output (playback) is stopped (step S155).
- step S150 When it is determined that the reproduction is continued (“YES” in step S150), that is, when the reproduction continuation information is received from the determination unit 306, the process returns to step S145. At this time, since the switch is in the ON state, the control unit 307 outputs the content to be reproduced to the output unit 308, and the output unit 308 outputs the content to be reproduced to a display device such as a display.
- the accepting unit 356 receives the permeability information received from the digital watermark detection unit 305 (step S200).
- Reception unit 356 determines whether or not the received permeability information is stored in comparison value storage unit 351 (step S205). Here, it is determined whether or not the value in comparison value storage section 351 is the initial value.
- step S205 When it is determined that the data is stored (“YES” in step S205), that is, when the reception unit 356 determines that the value in the comparison value storage unit 351 is the initial value, the received data is compared with the blueprint. The value is stored in the value storage unit 351 (step S210). Here, the reception unit 356 updates the value stored in the comparison value storage unit 351 to the received permeability information.
- the receiving unit 356 outputs a start instruction for instructing the update unit 353 to start the operation (step S215), and outputs the received watermark f blueprint to the comparison unit 352 (step S220).
- step S220 is performed.
- the updating unit 353 When receiving the start instruction from the receiving unit 356, the updating unit 353 starts measuring time (step S225). The updating unit 353 determines whether or not the time has been measured after a predetermined time (step S230). When determining that it has elapsed (“YES” in step S230), the updating unit 353 updates the value in the comparison value storage unit 351 (step S235). If it is determined that it has not elapsed (“NO” in step S230), the process returns to step S230.
- the comparison value storage unit 351 stores the transparency information received from the digital watermark detection unit 305. It is compared whether or not the comparison value matches (step S245).
- the comparison unit 352 When it is determined that they do not match (“NO” in step S245), the comparison unit 352 initializes the comparison value stored in the comparison value storage unit 351 (changes to “0x0000”), and the comparison result storage unit 357 The number of matches to be stored is also initialized (changed to “0”) (step S250).
- Comparison unit 352 outputs a stop instruction to update unit 353 (step S255).
- the updating unit 353 determines whether or not it has received the stop instruction (step S260). If it is determined that a stop instruction has been received (“YES” in step S260), the updating unit 353 stops measuring time (step S265) and waits for a start instruction. When determining that the stop instruction has not been received (“NO” in step S260), the updating unit 353 returns to step S230.
- comparison unit 352 displays the match information as a comparison result processing unit. Output to 354 (step S270).
- the comparison result processing unit 354 Upon receiving the match information from the comparison unit 352, the comparison result processing unit 354 counts the number of matches stored in the comparison result storage unit 357 (step S275). Here, the comparison result processing unit 354 updates the number of matches stored in the comparison result storage unit 357 to a result obtained by adding 1 to the number of matches.
- the comparison result processing unit 354 determines whether the number of matches is greater than or equal to a predetermined value (step S280).
- step S280 If it is determined that the number of matches is equal to or greater than the predetermined value (“YES” in step S280), the comparison result processing unit 354 generates match count excess information indicating that, and the generated match count excess information is displayed. The result is output to the determination result output unit 355 (step S285).
- the comparison result processing unit 354 When it is determined that the number of matches is not equal to or greater than the predetermined value ("NO" in step S280), the comparison result processing unit 354 generates the match count nonexistence information indicating that, and the generated match count not Excess information is output to the determination result output unit 355 (step S290).
- the determination result output unit 355 determines the information received from the comparison result processing unit 354 (step S295).
- the judgment result output unit 355 When it is determined that the received information is the information that the number of matches has not been exceeded ("match information not exceeded information in step S295"), the judgment result output unit 355 generates and generates the playback continuation information. The played back continuation information is notified to the control unit 307 (step S300).
- the determination result output unit 355 When it is determined that the received information is the information on excess number of matches (“match number exceeded information” in step S295), the determination result output unit 355 generates playback stop information and controls the generated playback stop information. This is notified to the unit 307 (step S305). [0120] 1.8 Variations
- a content storage unit 101 an embedded information generation unit 102, a digital watermark embedding unit 103, and a content surrounded by a broken line
- Each functional block such as the encryption key unit 104, the content key storage unit 105, the device key storage unit 106, the content key encryption key unit 107, and the output unit 108 is typically realized as an LSI that is an integrated circuit.
- Well ... These may be individually chipped! Alternatively, they may be chipped to include some or all of them.
- IC integrated circuit
- system LSI system LSI
- super LSI super LSI
- non-linear LSI depending on the difference in power integration as LSI.
- the method of circuit integration is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor. It is also possible to use an FPGA (Field Programmable Gate Array) that can be programmed after LSI manufacturing, or a reconfigurable processor that can reconfigure the connection and settings of circuit cells inside the LSI.
- FPGA Field Programmable Gate Array
- each functional block may be realized by software or a combination of LSI and software.
- the software may be tamper resistant.
- Each functional block such as the control unit 306, the control unit 307, and the output unit 308 may be realized as an LSI that is typically an integrated circuit. These may be individually chipped, or may be chipped to include some or all of them.
- IC integrated circuit
- system LSI system LSI
- super LSI super LSI
- non-linear LSI depending on the difference in the power density of LSI.
- the method of circuit integration is not limited to LSI, but a dedicated circuit or general-purpose processor. It may be realized. It is also possible to use a field programmable gate array (FPGA) that can be programmed after LSI manufacturing, or a reconfigurable processor that can reconfigure the connection and settings of circuit cells inside the LSI.
- FPGA field programmable gate array
- each functional block may be realized by software or a combination of LSI and software.
- the software may be tamper resistant.
- Each of the functional blocks such as 52, the update unit 353, the comparison result processing unit 354, the determination result output unit 355, the reception unit 356, and the comparison result storage unit 357 may be typically realized as an LSI that is an integrated circuit. These may be individually chipped or include some or all of them.
- One chip may be used.
- IC integrated circuit
- system LSI system LSI
- super LSI super LSI
- non-linear LSI depending on the difference in the power integration level of LSI.
- the method of circuit integration is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor. It is also possible to use a field programmable gate array (FPGA) that can be programmed after LSI manufacturing, or a reconfigurable processor that can reconfigure the connection and settings of circuit cells inside the LSI.
- FPGA field programmable gate array
- each functional block may be realized by software or a combination of LSI and software.
- the software may be tamper resistant.
- the force in which the embedding destination of electronic permeability is the content audio part is not limited to this configuration.
- the embedding destination of the electronic permeability may be configured to be a video part, or may be configured to be both an audio part and a video part.
- the digital watermark embedding destination is the video part
- the digital watermark embedding device 10 divides the video part into blocks that are transparent and information detection units, and divides the video part. In each block, a force value is embedded in at least one frame included in the block.
- the digital watermark detection apparatus 30 is configured to stop the output of content based on the determination result of the determination unit 306, but is not limited to this configuration.
- it may be configured such that output of only audio of content is stopped, output of only video is stopped, or output of both audio and video of content is stopped.
- the digital watermark detection device 30 may be configured to stop playback instead of stopping output of content, or may be configured to pause playback.
- the digital watermark detection apparatus 30 may be configured to perform some control on the output and playback instead of stopping the output and playback.
- the digital watermark detection device 30 may perform control such as reproducing or outputting audio data and / or video data with degraded quality, or reducing audio data volume or muting. .
- the comparison unit 352 if the permeability information detected by the digital watermark detection unit 305 and the comparison value stored in the comparison value storage unit 351 match, they match. The information is notified to the comparison result processing unit 354, and if they do not match, the comparison value stored in the comparison value storage unit 351 is reset (changed to “0x0000”), and the comparison result storage unit 357 The number of matches to remember is also reset, but is not limited to this configuration.
- comparison unit 352 a threshold value for the number of mismatches is determined in advance, and the permeability information detected by electronic watermark detection unit 305 is equal to the comparison value stored in comparison value storage unit 351. If there is a brute force, the number of times is counted, and the value stored in the comparison value storage unit 351 is reset (for example, "0" The number of matches stored in the comparison result storage unit 357 may be reset.
- the number may be reset, and the comparison value stored in the comparison value storage unit 351 may be reset each time there is a mismatch.
- the updating unit 353 updates the comparison value stored in the comparison value storage unit 351 at a predetermined timing, thereby allowing the comparison value (expected value) for the permeability information. ) Is calculated, but is not limited to this.
- absolute playback time information indicating how many seconds have elapsed from the playback start time when content starts at the top position, and playback of content. It is also possible to calculate a comparison value (expected value) for the absolute address information where a block is recorded when the first force is recorded in the playback order, and the information power and information equivalent to these.
- the comparison unit 352 when the watermark information detected by the digital watermark detection unit 305 and the comparison value stored in the comparison value storage unit 351 do not match, the comparison value storage unit 351, The comparison result storage unit 357 is reset, but the present invention is not limited to this.
- comparison value storage unit 351 and the comparison result storage unit 357 may be reset when the power is turned off.
- comparison value storage unit 351 and the comparison result storage unit 357 may be reset when reproduction of the digital content is paused or stopped.
- a counter value may not be assigned to a silence block.
- FIG. 12 when the blocks ⁇ 31, ⁇ 32, ⁇ 33, ⁇ 34, ⁇ 35, ... Is assigned a sequential counter value to each of the other blocks to which no counter value is assigned.
- 0X0001 is embedded in the block B31
- 0X0 002 is embedded in the block ⁇ 32
- 0X0003 (the next value after 0X0002) is embedded in the block ⁇ 35.
- the electronic watermark detection unit 305 outputs the detected watermark information to the determination unit 306 when the block force to be detected is also transmitted and information is detected.
- the digital watermark detection unit 305 outputs undetected information indicating that to the determination unit 306.
- the receiving unit 356 of the determining unit 306 outputs the received undetected information to the updating unit 353.
- the updating unit 353 determines whether the undetected information is received from the receiving unit 356 when the comparison value is updated. If it is determined that it has been received, the updating unit 353 stops updating the comparison value. If it is determined that it has not been received, the updating unit 353 updates the comparison value.
- the counter value is assigned sequentially to each block, and the counter value assigned to a block that is not a silent block (sound block) is embedded. It is not limited to this configuration.
- a counter value may be sequentially embedded in a predetermined number ( ⁇ ) of blocks.
- the updating unit 353 stores a predetermined number ⁇ in advance.
- the updating unit 353 updates the comparison value when the measured time exceeds a predetermined time of NX.
- N consecutive blocks are grouped into one group, and one or more consecutive groups are embedded by embedding the same transparent information in each block included in the group.
- the information can be embedded with different permeability.
- a plurality of block groups (for example, block groups including blocks B41, B42, and B43) in which watermark information of the same content is embedded corresponds to the blocks in the present invention, and watermark information is actually embedded.
- Each block (for example, blocks B41, B42, B43) corresponds to a sub-block.
- the content that is transparent and embedded with information is recorded on the recording medium and distributed.
- the present invention is not limited to this configuration.
- the digital watermark embedding device 10 and the digital watermark detection device 30 are not limited to this configuration.
- each function of the electronic permeability embedding device 10 and the digital watermark detection device 30 may be configured to be distributed among a plurality of devices.
- the counter value embedded as the electronic permeability is configured to monotonously increase, but is not limited to this configuration.
- Any configuration may be used as long as it is embedded in accordance with a predetermined rule.
- the update unit 353 updates to the comparison value “4”. do it.
- the comparison value storage unit 351 needs to store the permeability information of the current block and the permeability information of the previous block. For example, the comparison value storage unit 3
- the comparison result processing unit 354 notifies the control unit 307 of the reproduction stop information when the number of matches stored in the comparison result storage unit 357 reaches a predetermined value.
- the present invention is not limited to this configuration.
- a configuration in which a value indicating a matching ratio is set as a predetermined value may be used.
- the operation of the digital watermark detection apparatus 30 in this case will be described.
- the comparison unit 352 notifies the comparison result processing unit 354 of the match information when the comparison results in a match, and notifies the comparison result processing unit 354 of the mismatch information when there is no match. Similarly to the above, if they do not match, the comparison unit 352 resets the comparison value stored in the comparison value storage unit 351, resets the number of matches stored in the comparison result storage unit 357, and stops. Is output to the update unit 353.
- the comparison result processing unit 354 receives information related to the comparison result from the comparison unit 352 and counts the number of times of reception (the number of times of reception).
- the comparison result processing unit 354 performs the above-described operation when it receives the coincidence information as the comparison result.
- the comparison result processing unit 354 determines whether or not the calculation result P is a force greater than or equal to the second reference value Y. If it is determined that the value is greater than or equal to the second reference value, the comparison result processing unit 354 outputs the reproduction stop information to the control unit 307. If it is determined that the value is not equal to or greater than the second reference value, the comparison result processing unit 354 outputs the reproduction continuation information to the control unit 307.
- the configuration for encrypting the content in which the transparency is embedded is not limited to this configuration.
- it may be configured to record or send without encryption.
- the configuration may be such that after changing the key value based on other data, encryption is performed.
- the common key cryptosystem is used for content encryption and decryption, and content key encryption and decryption.
- the present invention is not limited to this.
- encryption may be performed by a public key cryptosystem.
- the content key storage unit 105 stores the key information encrypted by the content key encryption unit 107. This is not a content key, but a decryption key corresponding to the content key.
- the digital watermark detection device 30 determines whether or not the content recorded on the attached recording medium is encrypted, thereby determining transparency. Although the necessity of detecting information is determined, the present invention is not limited to this.
- the digital watermark detection device 30 may determine whether or not it is necessary to detect the watermark information by determining the type of the mounted recording medium.
- the digital watermark detection device 30 is of a type (for example, DVD-ROM or BD-ROM, collectively referred to as "ROM" hereinafter) to which the attached recording medium cannot be written. Judge whether there is a certain problem.
- the digital watermark detection apparatus 30 determines that the type of the loaded recording medium is ROM, it does not detect the electronic watermark, and the type of the loaded recording medium is not ROM.
- the recording medium is a writable type of recording medium (for example, BD-RZRE, hereinafter referred to as “R ZRE”)
- R ZRE writable type of recording medium
- copyright-protected content is recorded on a recording medium whose type is ROM, such as falsification! / And sold.
- a recording medium of type RZRE is used for illegally recording copyright-protected content or recording birthday parties. In other words, by using the above determination method, it is possible to determine whether the recorded content is copyright-protected.
- the digital watermark embedding device 10 is not limited to this force that is transparent and embeds information in the audio section.
- the digital watermark embedding apparatus 10 may embed the watermark information so that the position where the permeability information is embedded maintains continuity in the video portion.
- the digital watermark embedding device 10 uses one or more video blocks that have power in a predetermined section (for example, every 10 seconds) ⁇ 51, ⁇ 52, ⁇ , B53, B54, B55, ⁇ , Divide into B56.
- Each divided video block ⁇ 51, ⁇ 52, ⁇ , B53, B54, B55, ⁇ Image located at the beginning of B56 (hereinafter referred to as "first frame")
- F51, F52, ⁇ , F53, F54, F55,..., F56 are divided into predetermined units (for example, macroblocks, hereinafter referred to as “divided blocks”).
- the digital watermark embedding device 10 has a continuous embedment position of the transparent watermark for each of the first frames F51, F52,..., F53, F54, F55,. (For example, while changing the embedding position from left to right and from top to bottom), the data is transmitted and the information is divided into blocks B61, B62, B63, B63, B64, B65, ⁇ Embed in ' As in the above embodiment, if there is not enough information to embed information in the macroblock to be embedded, the information is not embeddable and information is not embedded. In the following, there is not enough information to embed watermark information! The macro block to be embedded is called a non-video block!
- the digital watermark detection unit 305 of the digital watermark detection apparatus 30 detects watermark information for each divided block (in the order of macroblock numbers) in the same manner as in the above embodiment, the detected watermark information is embedded.
- the obtained macro block number is acquired, and the acquired macro block number is output to the determination unit 306. Note that if the macroblock to be detected is a non-video block, it is transparent and no information is detected.
- the update unit 353 of the digital watermark detection apparatus 30 counts the number of video blocks up to the number of macroblocks every 10 seconds, which is the unit of the video block, and stores the comparison value as a comparison value.
- the value stored in the part 351 is updated.
- the comparison unit 352 Upon receiving the macro block number from the digital watermark detection unit 305, the comparison unit 352 determines whether or not the received macro block number matches the comparison value stored in the comparison value storage unit 351. . When determining that they match, the comparison unit 352 notifies the comparison result processing unit 354 of the match information. If it is determined that they do not match, the comparison unit 352 The comparison value stored in the comparison value storage unit 351 is reset (for example, changed to “0”), and the matching number indicating the number of times when the comparison result stored in the comparison result storage unit 357 is determined to match is also reset ( For example, change to “0”). Further, the comparison unit 352 outputs a stop instruction to the update unit 353 to stop updating the value stored in the comparison value storage unit 351 by the update unit 353.
- the video block has a predetermined section (every 10 seconds), and the force video block may be one frame. That is, watermark information is embedded in each frame.
- the embedding position of the permeability information reaches the lower right divided block, it has not been explained where the embedding position is set.
- the embedding position may be returned to the upper left divided block again, or the change of the embedding position is reversed (right force left in order of lower right force and left to upper embedding position). May be changed).
- the force that allows only the first frame of the video block to be embedded in the transparent blueprint is not limited to this.
- All the frames included in the video block may be made transparent and the information may be embedded.
- one or more frames hereinafter referred to as “effective frames” having sufficient information amount for embedding information in the macroblock to be embedded are embedded. If it exists, it is transparent and embedded in all valid frames.
- the first frame has enough information to embed information in the macroblock to be embedded! /. 1S not embedded, but not limited to this. If the information cannot be embedded because of transparency in the first frame, a frame (effective frame) having a sufficient amount of information for embedding the watermark information in the macro block to be embedded in the video block including the first frame. If there is more than one valid frame, the information may be embedded in at least one valid frame! / ,.
- a force that uses a unit of a divided block as a macro block is not limited to this.
- One frame may be divided into m X n pieces, and each of the divided m X n pieces may be used as divided blocks.
- each divided block is numbered sequentially from left to right and from top to bottom. Has been.
- the numbering power from 1 to m X nm is assigned to the divided blocks in order from left to right and from top to bottom.
- the update unit 353 of the digital watermark detection apparatus 30 counts numbers from 1 to m X n, and updates the value stored in the comparison value storage unit 351 using the counted value as a comparison value.
- the comparison unit 352 determines whether or not information is embedded in the divided block corresponding to the same number as the comparison value stored in the comparison value storage unit 351. Since the following operations are the same as described above, description thereof is omitted here.
- the watermark blue information may be the counter value shown in the above embodiment or may be an invariant value.
- the determination method using the counter value may be used in combination as described in the embodiment.
- the digital watermark embedding apparatus 10 uses a counter value as the permeability information to maintain the continuity of the divided blocks, but is not limited to this.
- the digital watermark embedding device 10 may maintain the continuity of the divided blocks depending on the embedding permeability and the strength of information.
- the strength to penetrate and embed information is indicated by levels 1 to 5, for example.
- the strength increases as the numerical value of the weakest level 1 increases, and the strength of level 5 increases the most!
- the digital watermark embedding device 10 divides the audio part into blocks of detection units (every 10 seconds), and assigns the divided blocks so that the strength for embedding permeability information circulates. If it is arranged, the strength will be 1, 2, 3, 4, 5, 1, 2, ... and harm ij, 1, 2, 3, 4, 5, 4, 3, 2 , 1, 2, ... and harm ij.
- the digital watermark embedding device 10 embeds watermark information in the corresponding block based on the assigned strength. As in the above embodiment, if the block to be embedded is a silent block, the permeability information based on the assigned strength is not embedded.
- the digital watermark detection unit 305 of the digital watermark detection apparatus 30 is the same as the above embodiment.
- the detected permeability is obtained and the strength of the information is acquired.
- the digital watermark detection unit 305 outputs the acquired intensity to the determination unit 306. If the macroblock to be detected is a non-video block, the watermark information is not detected, so the strength is not acquired.
- the update unit 353 of the digital watermark detection apparatus 30 updates the comparison value every 10 seconds, which is a detection unit, by the same method as the method that was circulated when assigning the intensity.
- the comparison unit 352 determines whether or not the received strength matches the comparison value stored in the comparison value storage unit 351. When determining that they match, the comparison unit 352 notifies the comparison result processing unit 354 of the match information. When determining that they do not match, the comparison unit 352 resets the comparison value stored in the comparison value storage unit 351 (for example, changes to “0”), and compares the comparison result stored in the comparison result storage unit 357. The number of matches indicating the number of times when it is determined to match is also reset (for example, changed to “0”). Further, the comparison unit 352 outputs a stop instruction to the update unit 353 to stop updating the value stored in the comparison value storage unit 351 by the update unit 353.
- the permeability information embedded in the block may be the counter value shown in the above embodiment or may be an invariant value.
- the determination method using the counter value may be used together as described in the embodiment.
- the digital watermark embedding device 10 is not limited to the force that embeds the permeability information based on the strength in the audio part.
- the digital watermark embedding apparatus 10 may embed transparency information based on the strength in the video part, or may be embedded in both the audio part and the video part.
- the amplitude of the permeability information that changes depending on the intensity is added to the amplitude of the audio data to be embedded, that is, What is necessary is just to change the amplitude of audio
- the luminance for the pixels in the macro block to be embedded in which transparency is embedded is determined based on the intensity! / Change it!
- the digital content that is transparent and the information is to be embedded is composed of an audio part and a video part.
- the digital content that is transparent and the information is to be embedded may only be effective in the audio part or only in the video part.
- the force using a force counter value that increments by one for generating watermark information is not limited to this.
- a gradual equation calculation may be used to generate the permeability information.
- n is an integer greater than or equal to 0, and a is an initial value.
- a generation method based on the permeability information used immediately before may be used.
- the result of doubling the value of the previously used permeability information is used as the new permeability information.
- the concept of “value used immediately before (permeability information)” includes an initial value (for example, “0” in the embodiment).
- the digital watermark embedding apparatus 10 generates the power information by calculating using the counter, but the present invention is not limited to this.
- the digital watermark embedding device 10 stores a predetermined numerical sequence in advance, and even if it acquires the watermark to be embedded according to the order of the stored numerical sequence, f blue report (value). Yo ...
- a character string may be used instead of the numeric string.
- Each of the above devices is specifically a computer system including a microprocessor, ROM, RAM, a hard disk unit, and the like.
- a computer program is stored in the RAM or hard disk unit.
- the microprocessor Each device achieves its function by the operation of the processor according to the computer program.
- the computer program is configured by combining a plurality of instruction codes indicating instructions to the computer in order to achieve a predetermined function.
- a system LSI is an ultra-multifunctional LSI that is manufactured by integrating multiple components on a single chip. Specifically, it is a computer system that includes a microprocessor, ROM, RAM, and so on. is there. A computer program is stored in the RAM. Microprocessor power The system LSI achieves its functions by operating according to the computer program.
- each part of the constituent elements constituting each of the above devices may be individually chipped, or may be chipped so as to include a part or all of them.
- IC integrated circuit
- LSI High Speed Interconnect
- Ultra LSI Ultra LSI
- the method of circuit integration is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor. You can use an FPGA (Field Programmable Gate Array) that can be programmed after manufacturing the LSI, or a reconfigurable 'processor that can reconfigure the connection and settings of the circuit cells inside the LSI.
- FPGA Field Programmable Gate Array
- the constituent elements constituting each of the above devices may be configured as an IC card that can be attached to and detached from each device or a single module force.
- the IC card or the module is a computer system composed of a microprocessor, ROM, RAM, and the like.
- the IC card or the module may include the super multifunctional LSI described above.
- the IC card or the module achieves its functions by the microprocessor operating according to the computer program. This The IC card or this module may be tamper resistant! /.
- the present invention may be the method described above. Further, the present invention may be a computer program that realizes these methods by a computer, or may be a digital signal that also has the computer program power.
- the present invention also provides a computer-readable recording medium capable of reading the computer program or the digital signal, such as a flexible disk, a hard disk, a CD-R.
- It may be recorded on OM, MO, DVD, DVD-ROM, DVD-RAM, BD (Blu-ray Disc), semiconductor memory, or the like. Also, it may be the digital signal recorded on these recording media.
- the present invention may be configured such that the computer program or the digital signal is transmitted via an electric communication line, a wireless or wired communication line, a network represented by the Internet, data transmission, or the like.
- the present invention is a computer system including a microprocessor and a memory, wherein the memory stores the computer program, and the microprocessor
- the program or the digital signal is recorded on the recording medium and transferred, or the program or the digital signal is transferred via the network or the like. It may be implemented by a computer system.
- the present invention is an electronic permeable embedding device that embeds information in digital content and embeds information, and generates electronic watermark information that generates a series of different digital watermark information for each first predetermined unit.
- electronic permeability embedding means for embedding a series of generated electronic permeability information in digital content.
- the digital watermark embedding means of the digital watermark embedding apparatus divides the audio data included in the digital content into blocks for each second predetermined unit, and for each divided block.
- a series of electronic permeability information may be sequentially associated and embedded. According to this configuration, since a series of different electronic permeability information is embedded for each block divided for each second predetermined unit in the audio data included in the digital content, the digital content is temporarily In the case of copying, it is possible to determine whether or not the illegal copying power is based on the ability to detect a series of electronic data for each divided block from the audio data contained in the copied digital content. Become.
- the digital watermark embedding unit of the digital watermark embedding apparatus applies a series of electronic permeability information to each divided block in order in association with each other and embeds a block including a silent part.
- the electronic permeability information associated with the block may not be embedded, and the electronic permeability information associated with the block may be embedded for a block that does not include a silent portion.
- the electronic permeability associated with the block is not embedded, and the silent portion is included. Since the electronic transparency information associated with the block is embedded in the non-existing block, if this digital content is copied, the audio data included in the copied digital content is silent. Part included For each block, it is possible to determine whether the copy is illegal or not based on whether or not electronic permeability information associated with the block is detected. In other words, even when the audio data included in the digital content includes a silent part, it is possible to determine whether or not the illegal copying power is available.
- the digital watermark embedding unit of the digital watermark embedding apparatus is configured to sequentially embed a series of electronic permeability information for each block that does not include the silent part among the divided blocks. Also good.
- the audio data included in the digital content is embedded with a series of electronic transparency information for each block that does not include silence, so if this digital content is copied.
- the first predetermined unit is N times the second predetermined unit (N is a positive number). Divides the audio data contained in the digital content into blocks for each second predetermined unit, sequentially associates a series of electronic permeability information for each first predetermined unit, and sets the first predetermined unit. Each time, the associated digital watermark information may be embedded in N blocks included in the first predetermined unit.
- the digital content is duplicated and embedded in the N blocks included in the first predetermined unit, so this digital content is temporarily copied.
- the audio data contained in the copied digital content In the unlikely event that a certain block is electronically transparent and cannot detect information for some reason, or it is erroneously detected, the digital watermark is detected from other blocks in the same first predetermined unit. Because it is possible to detect information, it is possible to determine for each first predetermined unit whether or not a series of electronic transparency or blueprints is detected, and as a result, whether or not it is an illegal copy. Can be discriminated.
- the digital watermark embedding unit of the digital watermark embedding apparatus divides the video data included in the digital content into blocks for each second predetermined unit, and a series of the divided blocks. Even if you embed information with electronic transparency.
- the first predetermined unit is N times the second predetermined unit (N is a positive number), and the electronic permeability of the embedding device is embedded. Divides the video data included in the digital content into blocks for each second predetermined unit, sequentially associates a series of digital watermark information for each first predetermined unit, and sets the first predetermined unit. For each of the N blocks included in the first predetermined unit, the associated electronic transparency or blueprint may be embedded in duplicate.
- the digital watermark information generating means of the digital watermark embedding device generates a series of different electronic permeability information for each first predetermined unit based on a predetermined rule. A little. According to this configuration, since a series of different digital watermark information generated based on a predetermined rule is embedded in the digital content, when this digital content is copied, from the copied digital content, It is possible to determine whether the copy is illegal or not based on whether or not a series of electronic permeability information is detected based on this predetermined rule.
- the digital watermark information generating means of the digital watermark embedding apparatus may generate a monotonically increasing numerical data string as a series of electronic permeability information.
- the digital watermark information generation means of the digital watermark embedding apparatus may generate a numerical data string that circulates periodically as a series of electronic permeability information.
- a counter for example, a 4-bit counter capable of sequentially outputting 1 to 16
- the electronic permeability is reduced. Can be configured to the price.
- the digital watermark embedding apparatus is configured to encrypt the digital content embedded with the digital watermark information based on the content key, the content key, and the digital content.
- the encryption is performed based on the device key held by the playback device.
- Two encryption means and a recording means for recording the encrypted content, the encrypted content key, or both on a recording medium may be provided.
- the digital content recorded and distributed on the recording medium is encrypted based on the content key, and the content key is encrypted based on the device key held by the reproducing device. Therefore, it becomes possible to protect digital contents from illegal copying more firmly.
- the digital watermark embedding device is a digital coordinator in which electronic permeability information is embedded.
- the second encryption means for encrypting based on the device key held by the device that reproduces the digital content, the encrypted content, the encrypted content key, or both, Provide output means for broadcasting or outputting to the network.
- the digital content to be distributed by broadcasting or via the network is encrypted based on the content key, and the content key is based on the device key held by the reproducing device. It is possible to protect digital contents from illegal copying more firmly.
- the present invention is a digital watermark detection apparatus for detecting digital content power electronic permeability information, and detects a series of different electronic power information for each first predetermined unit from digital content. It is characterized by comprising digital watermark detection means and control means for controlling the operation of the digital content based on the detected result.
- the digital watermark detection means of the digital watermark detection apparatus divides the audio data included in the digital content into blocks for each second predetermined unit, and a series of blocks for each divided block. Even if it detects electronic permeability information.
- the digital content is temporarily In the case of copying, it is possible to determine whether or not the illegal copying power is based on the ability to detect a series of electronic data for each divided block from the audio data contained in the copied digital content. Become.
- the digital watermark detection apparatus stores a comparison result storage unit that accumulates a comparison result between a series of electronic permeability information detected by the digital watermark detection means and an expected value of the electronic transparency information. And a determination result output means for determining whether or not the digital content is legitimate based on the accumulated comparison result.
- the comparison result between the series of digital watermark information detected by the digital watermark detection means and the expected value of the electronic permeability information is accumulated, and whether or not the illegal copy is determined based on the accumulated comparison result.
- the accumulated comparison results for example, the number of times the digital watermark information detected by the digital watermark detection means matched the expected value of the digital transparency information, It is possible to determine whether or not illegal copying is possible based on the number of times, the percentage of all comparisons, the number of mismatches, etc.
- the digital watermark detection apparatus includes an expectation storage unit that stores an expected value of the digital watermark information detected by the digital watermark detection unit, digital watermark information detected by the digital watermark detection unit, Comparison means for comparing expected values stored in the expected value storage means, and the comparison result storage means may store the number of times determined to be coincident as a result of comparison by the comparison means.
- the determination result output means of the digital watermark detection apparatus outputs the determination result to the control means when the number of times stored in the comparison result storage means reaches a predetermined number of times. Good.
- the series of digital watermark information detected by the digital watermark detection means is compared with the expected value of the digital transparency information, and the number of times determined to be coincident is determined based on the predetermined number of times. It is possible to determine whether the copy is legal.
- the digital watermark detection apparatus resets the comparison result stored in the comparison result storage means when the comparison means determines that there is a mismatch, and simultaneously stores the expected value storage means. Let's reset the expected value.
- the comparison result stored in the comparison result storage unit is reset.
- digital content is being played at a party, when a camcorder is unintentionally, discontinuously, or accidentally shot (copied), a series of electronic watermarks detected by the digital watermark detection means And the expected value of the digital watermark information do not match, and the comparison result stored in the comparison result storage means is reset.
- the digital content shot as such is judged as an illegal copy, and playback stops. None will happen.
- the digital watermark detection apparatus resets the comparison result stored in the comparison result storage means when the comparison means has compared and the number of times determined to be inconsistent has reached a predetermined number of times.
- the expected value stored by the expected value storage means may be reset each time it is determined that the values do not match.
- the comparison result is stored when the number of times determined to be inconsistent reaches a predetermined number. Since the comparison result stored in the means is reset, for example, in a movie theater, when digital content is aired, when shooting illegally (illegal copy) with a camcorder, Even when shooting continuously (for example, even if the camera position of the camcorder is intentionally moved or a person passes in front of the camera and shooting stops for a moment), the comparison results are stored. Since the comparison result stored by the means is never reset, such a case can be identified as an illegal copy.
- the digital watermark detection device resets the comparison result stored in the comparison result storage means when the reproduction of the digital content is paused or stopped, and simultaneously stores the expected value storage means. Let's reset the expected value. According to this configuration, when the digital content playback is paused or stopped, the comparison result stored in the comparison result storage means is reset. Digital content capability It is possible to reduce the chance of being identified as illegal copying.
- control means of the digital watermark detection apparatus stops output of audio data and / or video data included in the digital content based on the output of the determination result output means.
- the illegal copy when an illegal copy is determined, the illegal copy can be eliminated by stopping the output of the copied digital content.
- control means of the digital watermark detection apparatus deteriorates the quality of the audio data and / or video data included in the digital content based on the output of the determination result output means. It may be output.
- control means of the digital watermark detection apparatus may reduce or mute the volume of the audio data included in the digital content based on the output of the determination result output means.
- the digital watermark detection means of the digital watermark detection apparatus detects a series of digital watermark information for each divided block
- the digital watermark detection means The electronic permeability information embedded in the block may be detected.
- the present invention is a recording medium for recording digital content in which electronic permeability information is embedded by an electronic watermark embedding device that embeds electronic permeability information in digital content
- the watermark embedding apparatus includes a watermark information generating unit that generates a series of different digital watermark information for each first predetermined unit, an electronic permeability embedding unit that embeds the generated series of digital watermark information in digital content,
- the recording medium may record digital contents in which a series of different electronic transparent information is embedded for each first predetermined unit by an electronic watermark embedding device!
- the digital content recorded on the recording medium is embedded with a series of different electronic permeability information for each first predetermined unit
- the digital content is temporarily copied.
- This is because, for example, if digital content being broadcast in a movie theater is intentionally and continuously photographed (illegal copy) by a camcorder or the like, from the copied digital content, The ability to detect a series of electronic permeability information that differs for each first predetermined unit For example, while playing digital content at a birthday party, unintentionally and discontinuously by a camcorder, etc.
- the present invention is an information embedding device that embeds a plurality of transparent information along a reproduction time axis of content with respect to content including a plurality of frames having video data power. Then, the acquisition means for acquiring the content and position information indicating the position where the transparent information is embedded for each of the frames to be embedded included in the content are arranged on the reproduction time axis of the content. Based on the position information generating means that is generated in such a manner that the first regularity is changed according to the order, and at least two pieces of position information among the position information generated by the position information generating means. And an embedding means for embedding information in the corresponding frame.
- the information embedding device sequentially embeds the watermark information at the position indicated by the position information generated by the position information generating means in each of the embedding target frames included in the content. .
- the device that plays back the recorded contents can be The content that is being reproduced is illegally recorded depending on whether or not the first regularity for each embedding position of each of the detected one or more transparent information is detected. It is possible to determine whether or not it is a failure.
- the information embedding device further shows the strength of permeability and information embedding, and the strength information that changes with the second rule according to the arrangement order on the reproduction time axis. Is generated for each frame to be embedded, and when the embedding unit embeds the watermark information to be embedded, the embedding information is transmitted with the strength indicated by the corresponding intensity information. You can even embed! /
- the information embedding device when embedding watermark information, the information embedding device embeds the information based on the corresponding strength.
- the device that reproduces the recorded content can reproduce the recorded content. It is possible to confirm both the first regularity with respect to the embedding position based on the position information and the second regularity with respect to the strength with which the information is embedded. can do.
- the present invention is also an information embedding device that embeds a plurality of watermark information along the playback time axis of the content, and that is played back along the time axis.
- Acquisition means for acquiring the content to be generated, position information generation means for generating intensity information indicating the intensity at the time of embedding the watermark information in a manner that changes with regularity according to the arrangement order on the reproduction time axis of the content, Of the intensity information generated by the intensity information generating means, at least two pieces of intensity information are arranged along the reproduction time axis, and based on each of the arranged two or more pieces of intensity information, And embedding means for embedding watermark information.
- the information embedding device performs the embedding target frame included in the content.
- the information is sequentially embedded with the strength indicated by the strength information generated by the strength information generating means.
- the device that reproduces the recorded contents can reproduce the recorded content during reproduction. Whether or not the content being played back is illegally recorded can be determined based on whether or not the regularity of the strength with which the information is embedded is confirmed.
- the present invention provides a second content force including at least a part of the first content generated by the information embedding device according to (26) above.
- a detection device for detecting use wherein the second content detects the force information embedded in the first content, and indicates the position where the detected force information is embedded
- the information acquisition means for acquiring information, the position indicated by each of the one or more pieces of detection position information acquired in the past, and the position indicated by the detection position information acquired this time are the first in accordance with the arrangement order on the playback time axis.
- a first judging means for judging whether or not the first regularity is satisfied, and when the first judging means judges that the first regularity is satisfied, the one or more acquired in the past Total of detected position information and the detected position information acquired this time
- a second determining means for determining whether or not the first total number indicating the number is greater than or equal to a first threshold; and the first total number is determined by the second determining means to be the first
- a playback control means for controlling the playback so that playback of the second content does not operate normally when determined to be equal to or greater than the threshold value.
- the detection device depends on whether or not the first regularity based on the detected position information for each of the two or more pieces of transparent information detected during the reproduction of the second content is confirmed. It is possible to determine whether or not the second content is illegally recorded.
- each of the plurality of pieces of permeability information is embedded based on an intensity that changes with a second regularity in accordance with the arrangement order on the reproduction time axis
- the information acquisition unit includes: Further, detection intensity information indicating the intensity in which the detected watermark information is embedded is acquired, and the first determination means further includes one or more detection intensity information acquired in the past during the reproduction and the current detection information. It is determined whether the acquired detection intensity information satisfies the second regularity, and the second determination means is further configured by the first determination means. When it is determined that the second regularity is satisfied, a second total number indicating the total number of the one or more pieces of detection intensity information acquired in the past and the detection intensity information acquired this time is obtained.
- the reproduction may be controlled so that the reproduction for the second content does not operate normally.
- the detecting device can confirm the first regularity with respect to the embedding position based on the detected position information and the strength at which the transparent information is embedded during the reproduction of the second content. Therefore, it is possible to reinforce the judgment as to whether or not the second content is illegally recorded.
- the present invention provides a second content force including at least a part of the first content generated by the information embedding device according to (28) above.
- a detection device that detects information embedded in the first content from the second content, and obtains the embedded strength of the detected transparency information; 1st to determine whether the intensity indicated by each of the one or more pieces of detected intensity information acquired in the above and the intensity indicated by the detected intensity information acquired this time satisfy the regularity according to the order of arrangement on the playback time axis.
- the total number of the one or more pieces of detected intensity information acquired in the past and the detected intensity information acquired this time Is the total number indicating If the second determination means and the second determination means determine that the total number is equal to or greater than a threshold value, the second content is regarded as being illegally recorded. And a reproduction control means for controlling the reproduction so that the reproduction of the second content does not operate normally.
- the detection device determines whether or not the regularity for the first content is confirmed by the strength of each of the two or more pieces of transparent information detected during the reproduction of the second content. Therefore, it is possible to determine whether or not the second content is an illegally recorded content.
- the digital watermark embedding device and digital watermark detection device described above are the industry that supplies digital content to users, the manufacturing industry that manufactures digital content playback devices, and the sales business that sells digital content playback devices. Can be used in a management, ie repetitive and continuous manner.
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Computer Security & Cryptography (AREA)
- Databases & Information Systems (AREA)
- Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Computational Linguistics (AREA)
- Health & Medical Sciences (AREA)
- Audiology, Speech & Language Pathology (AREA)
- Human Computer Interaction (AREA)
- Acoustics & Sound (AREA)
- General Physics & Mathematics (AREA)
- Editing Of Facsimile Originals (AREA)
- Signal Processing For Digital Recording And Reproducing (AREA)
- Image Processing (AREA)
- Television Systems (AREA)
- Television Signal Processing For Recording (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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US12/304,877 US8369688B2 (en) | 2006-06-19 | 2007-06-19 | Information burying device and detecting device |
EP07767150A EP2040469A4 (en) | 2006-06-19 | 2007-06-19 | INFORMATION LANDING DEVICE AND DETECTION DEVICE |
JP2008522456A JP5097114B2 (ja) | 2006-06-19 | 2007-06-19 | 情報埋込装置、及び検出装置 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US81452806P | 2006-06-19 | 2006-06-19 | |
US60/814,528 | 2006-06-19 |
Publications (1)
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WO2007148662A1 true WO2007148662A1 (ja) | 2007-12-27 |
Family
ID=38833404
Family Applications (1)
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PCT/JP2007/062260 WO2007148662A1 (ja) | 2006-06-19 | 2007-06-19 | 情報埋込装置、及び検出装置 |
Country Status (6)
Country | Link |
---|---|
US (1) | US8369688B2 (ja) |
EP (1) | EP2040469A4 (ja) |
JP (1) | JP5097114B2 (ja) |
KR (1) | KR20090020632A (ja) |
CN (1) | CN101473644A (ja) |
WO (1) | WO2007148662A1 (ja) |
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Also Published As
Publication number | Publication date |
---|---|
US8369688B2 (en) | 2013-02-05 |
EP2040469A1 (en) | 2009-03-25 |
CN101473644A (zh) | 2009-07-01 |
EP2040469A4 (en) | 2009-09-30 |
JPWO2007148662A1 (ja) | 2009-11-19 |
US20100034513A1 (en) | 2010-02-11 |
KR20090020632A (ko) | 2009-02-26 |
JP5097114B2 (ja) | 2012-12-12 |
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