US20030077074A1 - Digital information recording apparatus, reproducing apparatus and transmitting apparatus - Google Patents

Digital information recording apparatus, reproducing apparatus and transmitting apparatus Download PDF

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Publication number
US20030077074A1
US20030077074A1 US09/982,291 US98229101A US2003077074A1 US 20030077074 A1 US20030077074 A1 US 20030077074A1 US 98229101 A US98229101 A US 98229101A US 2003077074 A1 US2003077074 A1 US 2003077074A1
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United States
Prior art keywords
digital information
information
recording medium
recording
period
Prior art date
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Abandoned
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US09/982,291
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English (en)
Inventor
Hiroo Okamoto
Hitoaki Owashi
Atsushi Yoshioka
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Hitachi Ltd
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Hitachi Ltd
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=27761506&utm_source=***_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=US20030077074(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority to JP2001002053A priority Critical patent/JP4029569B2/ja
Priority to US09/982,291 priority patent/US20030077074A1/en
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Assigned to HITACHI, LTD. reassignment HITACHI, LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: OWASHI, HITOAKI, OKAMOTO, HIROO, YOSHIOKA, ATSUSHI
Publication of US20030077074A1 publication Critical patent/US20030077074A1/en
Priority to US11/834,350 priority patent/US8311389B2/en
Priority to US13/649,882 priority patent/US9083942B2/en
Priority to US14/713,515 priority patent/US9773522B2/en
Priority to US15/690,640 priority patent/US10529372B2/en
Priority to US16/703,071 priority patent/US10854237B2/en
Priority to US17/106,332 priority patent/US20210104258A1/en
Abandoned legal-status Critical Current

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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G11B20/00681—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which prevent a specific kind of data access
    • G11B20/00688—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which prevent a specific kind of data access said measures preventing that a usable copy of recorded data can be made on another medium
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
    • G11B19/02—Control of operating function, e.g. switching from recording to reproducing
    • G11B19/06—Control of operating function, e.g. switching from recording to reproducing by counting or timing of machine operations
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
    • G11B19/02—Control of operating function, e.g. switching from recording to reproducing
    • G11B19/12—Control of operating function, e.g. switching from recording to reproducing by sensing distinguishing features of or on records, e.g. diameter end mark
    • G11B19/122—Control of operating function, e.g. switching from recording to reproducing by sensing distinguishing features of or on records, e.g. diameter end mark involving the detection of an identification or authentication mark
    • G—PHYSICS
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    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G11B20/00166—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which result in a restriction to authorised contents recorded on or reproduced from a record carrier, e.g. music or software
    • G—PHYSICS
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    • G11B20/10—Digital recording or reproducing
    • G11B20/10527—Audio or video recording; Data buffering arrangements
    • 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]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • 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
    • H04N21/254—Management at additional data server, e.g. shopping server, rights management server
    • H04N21/2541—Rights Management
    • H—ELECTRICITY
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    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/432—Content retrieval operation from a local storage medium, e.g. hard-disk
    • H04N21/4325—Content retrieval operation from a local storage medium, e.g. hard-disk by playing back content from the storage medium
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
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    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/433—Content storage operation, e.g. storage operation in response to a pause request, caching operations
    • H04N21/4334—Recording operations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
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    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/442—Monitoring of processes or resources, e.g. detecting the failure of a recording device, monitoring the downstream bandwidth, the number of times a movie has been viewed, the storage space available from the internal hard disk
    • H04N21/44204—Monitoring of content usage, e.g. the number of times a movie has been viewed, copied or the amount which has been watched
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
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    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • 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
    • H04N21/454—Content or additional data filtering, e.g. blocking advertisements
    • H04N21/4542—Blocking scenes or portions of the received content, e.g. censoring scenes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
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    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • 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
    • H04N21/4627—Rights management associated to the content
    • 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
    • H04N21/8355—Generation of protective data, e.g. certificates involving usage data, e.g. number of copies or viewings allowed
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/91—Television signal processing therefor
    • H04N5/913—Television signal processing therefor for scrambling ; for copy protection
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/10527—Audio or video recording; Data buffering arrangements
    • G11B2020/10537—Audio or video recording
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • 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
    • H04N2005/91314—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 pulse signal inserted in blanking intervals of the video signal, e.g. pseudo-AGC pulses, pseudo-sync pulses
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • 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
    • H04N2005/91328—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 copy management signal, e.g. a copy generation management signal [CGMS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
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    • H04N5/91—Television signal processing therefor
    • H04N5/913—Television signal processing therefor for scrambling ; for copy protection
    • H04N2005/91357—Television signal processing therefor for scrambling ; for copy protection by modifying the video signal
    • H04N2005/91364—Television signal processing therefor for scrambling ; for copy protection by modifying the video signal the video signal being scrambled

Definitions

  • the present invention relates to an apparatus for recording or reproducing digital information such as video and audio data, more particularly, to digital information recording and reproducing apparatus capable of setting a limit to playback or copying of the information to be recorded or reproduced by the authority of copyright holders and the like. Further, the present invention relates to a transmitting apparatus suitable for transmitting digital information to the recording and reproducing apparatus as above.
  • the digital recording scheme has an advantage that the quality is not deteriorated or very less degraded in the recording and reproducing process. But in the event that many high-quality copies are prepared and circulated at a site unknown to a copyright holder, there arises a problem that profits cannot be returned to the copyrighters. This is a pending problem for which countermeasures have been discussed in various fields since a case of digital audio tape deck at issue.
  • JP-A-11-146378 discloses a method of preventing preparation of high-quality copies by degrading the quality in advance of digitally recording information.
  • U.S. Pat. No. 5,896,454 discloses a method of adding copy control information of 2 bits to data information.
  • any one of copy inhibition, copy approval and copy approval for only one generation is selected of volition of copyright holders or information planners to control the operation of a recording apparatus.
  • the recording apparatus does not perform recording operation if copy inhibition is selected but performs recording operation if copy approval is selected. With copy approval for only one generation selected, the recording apparatus rewrites this control information into information for inhibiting any more copies and then operates to record.
  • JP-A-2000-149417 discloses a method of eliminating such a problem by using a means “temporary recording” even when the copy control information designates “copy never”.
  • information is once recorded physically on a recording medium and a limit of 90 minutes for instance is set to the period for reproduction and playback and the information is erased after a playback or at the termination of the period.
  • the recording is not for long-term conservation and multipurpose utilization but simply permits the broadcasting to be equivalently played back 90 minutes later.
  • the temporary recording is, because of its nature, carried out frequently by using a hard disc recorder built in the receiving apparatus.
  • the “copy one generation” conveniently gives the users a chance of backing up the information recorded temporarily on a hard disc for instance.
  • the copy control information changes to “no more copies” to prevent any more copying. But, when copying of the temporarily recorded information is permitted, though only once, the copy permission remains for a long time, giving anxiety to the copyright holders.
  • “no more copies” is once set, desired exchange of the medium storing the contents becomes impossible and disadvantageously the users are forced to suffer from inconvenience.
  • an object of the present invention is to provide more specifically a unit for preventing circulation of unauthorized copies and permitting the user to perform conditional playback and the like.
  • Another object of the invention is to provide a unit for eliminating the aforementioned anxiety of the copyright holders and inconvenience of the users through a method of meeting the compatibility between profits of the user and the copyright holder.
  • Still another object of the invention is to provide a unit for limiting a condition for permitting playback of recorded information for instance so as to enable the copyright holder to further control the range of information utilization.
  • the effective period, available inside a recording medium, of information permitted for temporary recording is prescribed.
  • the apparatus has a unit for disabling reproduction and playback after expiration of a prescribed time following recording initiation. Through this, the information temporarily recorded on the medium can be prevented from being used later for unauthorized purposes.
  • the effective period inside the recording medium referred to herein will be called “retention period”. Further, the effective period starting with playback initiation is also prescribed.
  • the apparatus has a unit for disabling repetitive reproduction and playback after expiration of a prescribed time following the initial start of playback. Through this, playback by many and unspecified users can be prevented.
  • the effective period referred to herein will be called “playback permission period”.
  • the retention period is set to be equal to or longer than the playback permission period but this is not limitative.
  • Many types of reproducing apparatus cause their operation to temporarily pause or stop during reproduction. Accordingly, even when reproduction is started during the playback permission period, the retention period sometimes happens to stop or end before the playback comes to an end. In that case, concurrently with the stop of the retention period, reproduction is disabled to proceed any more.
  • a part of information succeeding the stopping location is once allowed for continuous playback up to the end. In that case, conditionally, further pause and stop are inhibited.
  • a part once subjected to playback is inhibited for repetitive playback. This can be implemented by disabling backward feed of the medium or making, in some way, a part once subjected to playback non-reproducible during backward feed.
  • the present invention prescribes the effective period for the information, conditioned to “copy one generation” to stay in the recording medium following recording of the information.
  • the apparatus has a unit for handling the information as being subject to “no more copies” after expiration of the prescribed period following recording so as to prevent copying, thereby eliminating anxiety of the copyright holder about the long-term stay of the information subject to “copy one generation”.
  • the effective period referred to herein will be called “copy permission period”.
  • the copy control information changes to “no more copies” to disable copying.
  • FIG. 1 is a block diagram showing an embodiment of the configuration of the whole of a digital information transmitting, receiving, recording and reproducing system to which digital information recording apparatus, reproducing apparatus and transmitting apparatus according to the invention are applied;
  • FIG. 2 is a block diagram showing an embodiment of the digital information transmitting apparatus according to the invention.
  • FIG. 3 is a block diagram of a digital information receiving side in FIG. 1;
  • FIG. 4 is a block diagram showing an embodiment of a recording circuit in the digital information recording apparatus according to the invention.
  • FIG. 5 is a block diagram showing an embodiment of a recording and reproducing unit in the digital information recording apparatus and reproducing apparatus according to the invention.
  • FIG. 6 is a block diagram showing an embodiment of a reproducing circuit in the digital information reproducing apparatus according to the invention.
  • FIG. 7 is a block diagram showing another embodiment of the reproducing circuit in the digital information reproducing apparatus according to the invention.
  • FIG. 8 is a diagram showing an embodiment of the structure of first control information according to the invention.
  • FIG. 9 is a diagram showing an embodiment of the structure of copy control information according to the invention.
  • FIG. 10 is a diagram showing an embodiment of the structure of second control information according to the invention.
  • FIG. 11 is a diagram showing an embodiment of recording data on recording medium according to the invention.
  • FIG. 12 is a block diagram showing still another embodiment of the reproducing circuit in the digital information reproducing apparatus according to the invention.
  • FIG. 13 is a block diagram showing another embodiment of the recording circuit in the digital information recording apparatus according to the invention.
  • FIG. 14 is a block diagram showing another embodiment of the digital information reproducing apparatus according to the invention.
  • FIG. 15 is a block diagram showing an embodiment of an erasing circuit in the digital information reproducing apparatus according to the invention.
  • FIG. 1 is a block diagram showing an overall configuration of a transmitting, receiving, recording and reproducing system including an information distributor.
  • the present invention involves a recording apparatus, a reproducing apparatus and a transmitting apparatus, having a reproducing circuit 1 , a recording circuit 2 , an information distributor 3 such as a broadcasting station, a repeater 4 , a tuner for RF (radio frequency) 5 , a recording/reproducing unit 6 and a display 7 .
  • RF radio frequency
  • the information distributor 3 such as a broadcasting station transmits a signal electromagnetic wave modulated with information through the medium of the repeater 4 such as, for example, a broadcasting satellite. Otherwise, transmission based on a cable may be employed.
  • the RF tuner 5 on the receiving side receives and demodulates the transmitted information and thereafter, the recording circuit 2 converts it into a signal suitable for recording on a recording medium and the recording/reproducing unit 6 records the converted signal.
  • the recording/reproducing unit 6 also reproduces the information from the recording medium.
  • a reproduction signal is applied to the display 7 through the reproducing circuit 1 to ensure playback of the information representing original video and audio data. Though not illustrated, the received information can also be played back directly. In case information recorded in advance on a removable recording medium is serviced, only the operation succeeding the reproducing operation by the recording/reproducing unit 6 is carried out.
  • FIG. 2 is a block diagram showing an embodiment of the construction of the information distributor 3 (transmitting apparatus) such as a broadcasting station.
  • the transmitting apparatus comprises a program generator 31 , an encode circuit 32 for performing compression based on, for example, MPEG scheme, a scrambler circuit 33 , a modulator circuit 34 , a transmitting antenna 35 , a service information applying circuit 36 and an input terminal 37 .
  • the amount of data in information such as video/audio information generated by the program generator 31 constituted of a camera or recording/reproducing device is compressed by the encode circuit 32 so that the information may be transmitted with a less bandwidth.
  • the information is encrypted by means of the scrambler circuit 33 to enable a specified audience to take part in playback.
  • the encrypted information is modulated to a signal suitable for transmission by means of the modulator circuit 34 and then is emitted from the transmitting antenna 35 in the form of an electric wave directed to the repeater such as, for example, a broadcasting satellite.
  • the service information applying circuit 36 adds information such as copy control information and retention information and playback/copy permission period information.
  • the present time information may be applied which can be utilized as a start point of the retention period and copy permission period.
  • request information is inputted to the input terminal 37 through a telephone line for instance. This is utilized for the case where the information to be transmitted is determined in response to a request from audiences as exemplified by video-on-demand.
  • FIG. 3 is a block diagram showing an embodiment of the RF tuner 5 shown in FIG. 1.
  • the RF tuner 5 includes an RF/IF converter circuit 51 , a demodulator circuit 52 , a descrambler circuit 53 for decoding or decrypting the cipher applied to the signal and an output terminal 54 .
  • An electric field from the repeater for example, a broadcasting satellite is inputted to the RF/IF converter circuit 51 .
  • the RF-band electric wave is converted in frequency to a frequency of IF (intermediate frequency) band or is converted into a signal of a constant band independent of a receiving channel.
  • the demodulator circuit 52 releases the modulation operation applied for the purpose of transmission.
  • the cipher in the demodulated signal is then decrypted by the descrambler circuit 53 and then delivered to the output terminal 54 .
  • FIG. 4 is a block diagram showing an embodiment of the recording circuit 2 .
  • the recording circuit 2 has an input terminal 201 for a signal to be recorded, a memory circuit 202 such as a semiconductor memory, a recording signal processing circuit 203 , an output terminal 204 for a signal to be recorded on a recording medium, an information detection circuit 205 , a recording control circuit 206 , a clock 107 and an input terminal 208 for records of a control signal during reproduction.
  • the signal inputted through the input terminal 201 is applied with various control codes.
  • a signal applied with the copy information “copy never” and designated with the aforementioned retention period and playback permission period will be described.
  • the data as above is applied to the information by means of, for example, the service information applying circuit 36 of FIG. 2.
  • the inputted data is once stored block by block in the memory circuit 202 .
  • the data is fed to the information detection circuit 205 which in turn detects the control information concerning copying.
  • the recording control circuit 206 decides on the basis of the data as above whether the signal is permitted for recording and sends a decision result to the recording signal processing circuit 203 .
  • the recording signal processing circuit 203 has already been applied with the data from the memory circuit 202 and on the basis of the control signal from the recording control circuit 206 , it interrupts the signal when recording is inhibited but applies a modulation suitable for the medium used when recording is permitted, thus delivering a modulated signal to the output terminal 204 .
  • the output signal is recorded on a medium such as a tape or disc. For example, even when the control information is “copy never”, the output signal is recorded temporarily on the medium if the effective retention period and playback permission period are designated.
  • the control signal may be applied externally, separately from video/audio data.
  • the information including the copy control information and the retention period and playback permission period is generated by the recording control circuit 206 and is added to the recording signal by means of the recording signal processing circuit 203 .
  • the present time during recording delivered out of the clock 107 is also recorded concurrently. If the present time is included in the received information, this data may be used or the clock 107 may be set by the received information. Through this, the present time during recording can be prevented from being altered.
  • control information being “copy any generation”
  • the effective copy permission period is designated or the move permission period is designated as necessary
  • information is recorded temporarily on the medium while keeping “copy one generation” unchanged.
  • the control information is “no more copies”
  • copying is inhibited as a rule and therefore, the output of, for example, the recording signal processing circuit 203 is interrupted.
  • recording of information onto the medium is permitted even for “no more copies” on the premise that a counterpart of the information on the side of the apparatus transmitting that information will be erased.
  • control information is changed to “no more copies” by means of the recording signal processing circuit 203 during recording.
  • FIG. 5 is a block diagram showing an embodiment of the recording/reproducing unit 6 shown in FIG. 1.
  • the recording/reproducing unit 6 includes an input terminal 61 , a recording amplifier 62 , a recording media drive 63 carrying a recording medium such as a hard disc/digital video disc/video tape, a reproducing amplifier 64 , an output terminal 65 , a mechanism control circuit 66 and an input terminal 67 .
  • the output signal of the recording circuit 2 is supplied to the input terminal 61 .
  • This signal is amplified by the recording amplifier 62 so as to be able to drive a laser generation device or a magnetic head and is then recorded on the recording medium as above by means of the recording media drive 63 .
  • a signal reproduced from the recording medium is amplified by the reproducing amplifier 64 up to a level that can afford to be processed in the succeeding stage of signal processing and thereafter delivered to the output terminal 65 .
  • the mechanism control circuit 66 is for a motor used to drive the recording media drive 63 and is responsive to a control signal inputted to the input terminal 67 to control the recording medium. Though not illustrated, the control signal inputted to the input terminal 67 is fed from the recording circuit 2 or reproducing circuit 1 .
  • FIG. 6 is a block diagram showing an embodiment of the recording circuit 1 of the information reproducing apparatus according to the invention.
  • the reproducing circuit 1 includes an input terminal 101 for a reproduction signal, a reproducing signal processing circuit 102 , a block detection circuit 103 , a memory circuit 104 such as a semiconductor memory, an error correction circuit 105 , a signal output circuit 106 , a clock 107 , a decoder 108 for decoding moving picture compression, a watermark detection circuit 109 for decryption of a watermark embedded in an image, an output terminal 110 for sending a signal to the display, an information detection circuit 111 for control signals, an output control circuit 112 for deciding, on the basis of a control signal, whether delivery of a reproduction signal is permissible, an output terminal 113 for the signal kept away from decoding of the cipher, an output terminal 114 for a decision result, and an output terminal 116 for the control information delivered to the input terminal 208 of recording circuit 2 .
  • a memory circuit 104
  • An output of the signal output circuit 106 is also supplied to the output terminal 113 so as to be used for further copying by a different recording device connected to this terminal 113 . But in the case of a signal applied with stringent copy limit as described previously, the signal delivered from this output terminal is subject to “copy never” and therefore, copying often fails to fulfill itself.
  • An output of output control circuit 112 to be described later may be supplied to the signal output circuit 106 to prevent the signal from being delivered to the output terminal 113 .
  • the information detection circuit 111 for control signal detects data indicative of the retention period and playback permission period.
  • One data detection operation per one frame of an image suffices to provide sufficient information as will be described later and the data may be set to the header of a recording track in the case of, for example, a tape medium.
  • the data detection operation as above may be once performed at intervals of a predetermined amount of data. If that data is recorded frequently, thinning-out detection operation may be carried out during reproduction.
  • the output control circuit 112 decides, on the basis of the detected retention period and playback permission period as well as playback start time, time for recording and the present time from the clock 107 , whether the delivery of reproduction output is permissible, thereby controlling the output to the decoder 108 .
  • the information detection circuit 111 may also detect the control signal for “copy never” and “no more copies” in order for the output of the output control circuit 112 to control the signal output circuit 106 , thus ensuring that when copying is inhibited, the delivery of the reproduction signal to the output terminal 113 can be prevented.
  • the output of the output control circuit 112 is also applied to the output terminal 114 .
  • This output signal is used when the signal detected by the information detection circuit 111 includes information for conditionally permitting a device connected externally to carry out recording/reproduction, in order to transmit the information to the outside.
  • information indicative of this expiration may be supplied from the output terminal 114 to the aforementioned input terminal 67 of FIG. 5 to stop the recording media drive 63 .
  • the moving image data compression applied in advance of the transmission by the decoder 108 is decoded from the output of the signal output circuit 106 and a resulting signal is fed to the output terminal 110 to permit playback with the display connected to the output terminal 110 .
  • an intact decoded digital signal may be delivered or an analog signal converted from the digital signal may be delivered.
  • the watermark detection circuit 109 operates to detect the watermark.
  • the information detected from the watermark may be used to perform a similar control operation.
  • the clock 107 is of course required of accuracy to some extent. If the clock can easily be altered with malicious intent of the user, then it will not fulfil itself. Further, it is desirable that the clock be controllable in response to time information from, for example, the broadcasting station.
  • the clock may be designed to make the apparatus inoperative when the time is altered intentionally.
  • the information detection circuit 111 for control signal detects data of the copy control information, for example, “copy one generation” and the copy permission period.
  • the output control circuit 112 decides, on the basis of the detected control information and copy permission period as well as recording time and the present time from the clock 107 , whether copying is permissible and sends a decision result to the signal output circuit 106 . If the copy information “copy one generation” is available within the copy permission period, the signal output circuit 106 passes the reproduction signal.
  • the control signal On the medium of the external device for preparation of copies, the control signal is changed to “no more copies”. If the copy information “copy one generation” is outside the copy permission period, the control information can be rewritten to “no more copies” to disable the external device to copy. As necessary, the information in the medium may be rewritten to “no more copies” by means of the recording circuit. Obviously, rewrite on the reproducing side by the signal output circuit 106 is not limitative and it may be done with another reproducing circuit block.
  • FIG. 7 is a block diagram showing another embodiment of the reproducing circuit according to the invention. Constituent components identical to those in the FIG. 6 embodiment are designated by identical reference numerals. The present embodiment differs from the FIG. 6 embodiment in that the decoder 108 , watermark detection circuit 109 and output terminal 110 are removed. These components are often built in the display 7 of FIG. 1 and in that case, the reproducing circuit is separated as a unitary circuit, leading to the construction shown in FIG. 7.
  • the output control circuit 112 On the basis of the information, such as retention period, playback permission period, copy permission period and copy control information, detected by the information detection circuit 111 , the output control circuit 112 sends a control signal to the signal output circuit 106 in order to control permission/inhibition of the delivery of the signal to the outside and rewrite of the control information.
  • the signal at the output terminal 113 can be supplied to the display as well as another external recording device as in the case of the FIG. 6 embodiment.
  • FIG. 8 is a diagram showing an embodiment of a first control signal transmitted from the information distributor 3 and recorded on the recording medium during recording in the foregoing embodiments.
  • Program number 300 indicates what number is allotted to a program in question on the medium.
  • Sector information 301 indicates numbers allotted to sectors set up by dividing the program in a predetermined unit. The division can be made in a fixed unit, for example, in a unit of 2 k bytes or in a constant unit of information, for example, in a unit of division during encoding.
  • the numbers may be set up within the program or may be serial numbers set up throughout the recording medium.
  • Information such as recording time 305 to be described later is added in a unit of sector.
  • Time information 302 indicates how long the recording part of interest proceeds after start of the program.
  • Type information 303 indicates attribute information of the program as to whether the program is sold, rental, self-made or distributed from broadcasting.
  • Copy control information 304 indicates the aforementioned control information such as “copy never”, “copy one generation” or the like.
  • FIG. 9 shows a structure of the copy control information 304 .
  • Version number 311 indicates which version the information belongs to.
  • the copy control information 304 must be so flexible as to add some items other than those shown in FIG. 9 or to erase some items from FIG. 9, as necessary. Accordingly, with a view of determining how what information is arranged in sequence in various ways, the version is managed. For example, when 8 bits are allotted to the version information 311 , the copy control information 304 can be used in 256 ways.
  • Output control 312 controls the permission/inhibition of delivery of the output from the digital output terminal 113 or the analog output terminal 110 .
  • control of the output delivery it is first decided, from the form of the output and encryption conditions, whether safety can be assured and then the permission/inhibition of the output delivery is controlled. Further, the output delivery permission/inhibition may be controlled depending on resolution for instance. For example, in the case of a video signal of high resolution such as high vision video, control is such that the video signal as it is may be inhibited from being delivered but a video signal set up by degrading the resolution may be permitted for delivery.
  • Copy control information 313 controls copying to a digital recording device. For example, when this information is of 2 bits, “11” may designate “copy never”, “10” may designate “copy one generation”, “01” may designate “no more copies” to the effect that one copy obtained through “copy one generation” is no more permitted for copying, and “00” may designate “copy free”. Different CGMS's may be provided for the digital signal output and analog signal output, respectively.
  • Copy control information 314 controls copying to an analog recording device.
  • a psuedo-sink pulse may be added to an analog video signal for the purpose of controlling permission/inhibition of copying.
  • Move mode 315 is information concerning permission/inhibition of “move”.
  • the term “move” means that information is copied onto a different medium and thereafter, a counterpart of that information recorded on the original medium is erased. This ensures that only one copied information piece can always be allowed to exist, making it possible to keep the condition that many repetitive copying operations result in substantially one copying operation.
  • copy control information is again returned to “copy one generation” so that the information of interest can be sent to the copying destination to enable the sent information to be copied and after the copying, the original information is erased.
  • the move mode 315 may prescribe the move permission count in addition to the move permission.
  • the move permission count information may be decremented each time that a move operation is carried out.
  • the move mode 315 is of 4 bits
  • the permission count ranging from 0 to 15 can be defined.
  • the definition may be such that even when all of the 4 bits are “1111”, the count is not 15 but is infinite.
  • Playback count 316 is for prescribing the playback permission count and is ruled as necessary.
  • the playback count is used when, for example, in addition to a limit set to the effective period by the aforementioned retention period, the playback count is desired to be limited.
  • the playback permission count is decremented each time that one playback operation is carried out. When all of the bits are “1” initially, the limitation to the count can be handled as being nullified.
  • Playback longevity period 317 is used when the playback operation is limited temporally. For example, when the playback longevity period is of 16 bits to ensure management in a unit of minute, temporal limitation up to about 45 days can be available. For all of the bits being “1”, this period can also be handled as designating unlimitedness. If the CGMS 313 is “copy never”, the rules in the aforementioned playback permission period for instance are predominant in connection with the temporal limitation to the playback operation. Accordingly, the rules in the playback longevity period 317 are used as information available in an instance excepting the above. In an alternative, the playback longevity period 317 may be incorporated into the playback permission period so as to be handled as unified information.
  • Pause period 318 prescribes a period for permitting a pause operation (temporary stop).
  • the pause period can be handled similarly to the playback longevity period 317 . More particularly, it happens that playback operation is required to be stopped temporarily on urgent business due to a visitor. In such a case, the pause period is used to temporally limit the temporary stop.
  • Delayed start time 319 is used to limit time for starting working. While the aforementioned retention period sets a limit to working, starting with the recording time, the delayed start time 319 permits working, starting with absolute time such as 12.00 p.m., Jan. 1, 2001 for instance. This is suitable to permit simultaneous disclosures at a time. After the delayed start period has elapsed, information is permitted for playback and delivery for instance. As the delayed start time, the absolute time may be described or a difference time (relative time) from a time (for example, 12.00 p.m., Jan. 1, 1970) agreed by persons in the same line of business may be described. If all of the bits are “0”, the recording time may be the start time.
  • the recording time 305 in FIG. 8 records, for example, the time of the clock 107 of FIG. 4 or the time supplied from the service information applying circuit 36 of FIG. 2.
  • the recording time 305 can be recorded in a unit of sector for instance.
  • information covering retention period 306 A, copy permission period 306 B, playback permission period 307 A and move permission period 307 B is further used. All of the information can be used but only two of 306 A and 307 A, only two of 306 B and 307 B or only one of, for example, 306 B may sometimes be used.
  • the copyright holder or the software producer rules the retention period 306 A and the playback permission period 307 A as described previously.
  • the retention period is set to 9 hours and the playback permission period is set to 2 hours.
  • a code of “no limit” may be applied.
  • limitation to the playback count may be prescribed.
  • the copy permission period 306 B and move permission period 307 B are ruled used similarly and the latter is applied only when needed. Also, limitation to the move permission count may be prescribed.
  • User identification information 308 is recorded when a code inherent to a user is used with the aim of permitting information recorded on the medium to be reproduced by only the same apparatus as that used during recording or only the user.
  • Encryption information 309 is used to decode a cipher during playback when information is encrypted and recorded on the recording medium. This will be described again later with reference to FIGS. 12 and 13.
  • the information per se has a large amount of data and therefore, code numbers may be recorded and information corresponding to a code number stored in advance may be drawn out by means of the reproducing apparatus so as to be used.
  • the information as above is recorded as necessary at a relatively short temporal pitch, for example, every image frame or at the rate of predetermined amount of data.
  • FIG. 10 is a block diagram showing a structure of a second control signal recorded during reproduction in the present embodiment.
  • the second control information includes playback start time 321 , playback start sector number 322 and playback stop sector number 323 .
  • the playback start time 321 records a time counted by, for example, the clock 107 of FIG. 12 to be described later.
  • a sector number at that position is recorded in the playback stop sector number 323 . Since playback times at sectors on the way can be calculated from the playback start time 321 , playback times at all sectors subject to reproduction can be known. Of course, the playback time can be recorded in a unit of sector.
  • FIG. 11 diagrammatically shows recording positions of the control signal and information data such as video and audio data on the recording medium.
  • Recording positions shown at (a) in FIG. 11 are suitable for the tape medium.
  • the block of the control signal is preferably provided, for example, every recording track. Accordingly, in each track, a block of the control signal is arranged in the header part, for instance, to precede the information such as video and audio data.
  • Recording positions shown at (b) in FIG. 11 are suitable for a digital video disc.
  • the control signal and video and audio data are preferably provided every sector having a certain amount of information. Accordingly, they are arranged at the header part every sector.
  • Recording positions shown at (c) in FIG. 11 are suitable for a hard disc.
  • the information such as video and audio data and the control signal are recorded at positions spaced apart from each other on the disc to permit the whole of the control signal to be read within a short period of time during start.
  • the first control information may be recorded at the header part and the second control information may be recorded at a position spaced apart therefrom. Since the second control information is to be recorded or rewritten during reproduction, it is required to be recorded at an independent or isolated position.
  • the second control information may be recorded in, for example, the memory device or memory circuit 104 mounted externally of the recording medium or in a memory device in an independent apparatus.
  • FIG. 12 is a block diagram showing a reproducing circuit 1 according to the present embodiment
  • FIG. 13 is a block diagram showing a recording circuit 2 according to the present embodiment.
  • Constituent components identical to those in FIGS. 6 and 4 are designated by identical reference numerals and will not be detailed.
  • the present embodiment is effective when it is required that only predetermined users be allowed to take part in playback or when a fee is charged.
  • FIG. 12 there are provided a decryption circuit 131 and an input terminal 132 for an identification code inherent to the apparatus and in FIG. 13, there are provided an encryption circuit 233 and an input terminal 234 for an identification code inherent to the apparatus or an apparatus permitted for playback.
  • encryption is carried out with the identification code of the apparatus fed from the input terminal 234 . Without performing descramble in the RF tuner 5 , two kinds of encryption may be carried out in an overlap fashion.
  • decryption circuit 131 of FIG. 12 decryption is carried out with the identification code of the apparatus fed from the input terminal 132 . If the identification code is not an authorized one, normal decryption fails to proceed to thereby prevent the playback from being done.
  • encryption with the identification code is exemplified but this code may be added to the aforementioned block of the control signal and may be detected on the reproducing side to decide whether the delivery of signal is permissible.
  • Encryption may be done in a unit of program but when the encryption is carried out while changing the key to the encryption in a unit of sector and individual keys are recorded, an encryption process can be performed in the unit of sector.
  • the time is again confirmed and if the time is within the retention period 306 A, playback resumes.
  • a playback time at that location is confirmed and if the difference between the playback time and the present time is within the playback permission period 307 A, a playback is permitted.
  • fast feed it can be known by confirming the second control information that no playback is carried out throughout a fast feed range. Therefore, when a playback is initiated, permission/inhibition of the playback is decided by only the retention period 306 A regardless of the playback permission period 307 A. Namely, a playback longevity period after one playback operation subject to the playback permission period 307 A is controlled for a playback longevity period following recording subject to the retention period 6 A.
  • the pause period can also be controlled depending on the playback permission period 307 A.
  • permission/inhibition of the initial playback start is controlled by the retention period 306 A and when a playback stop is carried out or a pause is taken after start of the playback, the period for stoppage is measured in order that resumption of playback is permitted when the measured period is within the playback permission period 307 A but resumption of playback is inhibited when the measured period exceeds the playback permission period 307 A. Further, by inhibiting the backward feed, it is possible to steadily permit only one playback operation. In this case, control can be undertaken without recording the second control information.
  • Operation when the copy permission period 306 A and move permission period 307 B are used is as follows. Firstly, if the difference between a recording time 305 of a sector to be reproduced and the present time indicated by the clock 107 is within the copy permission period 306 B at the playback initiation, normal playback is started and a reproduction signal for copying is delivered to the outside. Since the copy control information “copy one generation” remains intact in the signal reproduced and delivered to the outside, recording is permissible for the external device. During recording, however, the copy control information is rewritten to “no more copies” and as a result, any more copying is prevented.
  • the copy control information can be changed to, for example, “no more copy” so as to inhibit copying.
  • the playback may proceed to the end with the copy control information kept to be “copy one generation” and copying may be permitted.
  • a copy longevity period after recording subject to the copy permission period 306 B is controlled.
  • another recording apparatus is allowed to move information to another medium on the premise that the original information is erased. If expiration of the copy permission period is detected through the aforementioned method at the start of playback, information having its copy control information rewritten to “no more copies” is added with information of move permission period 307 B as necessary and then moved to the external recording apparatus.
  • the original information is erased from the medium through a method to be described later. Thereafter, if the difference between the recording time 305 and the present time indicated by the clock 107 is within the move permission period 307 B, move between the media is permissible.
  • the copy control information on the original recording medium is changed from “copy one generation” to “no more copies” as the copying operation proceeds.
  • the copy control information can be changed at the end of the copy permission period to permit preparation of a plurality of sheets of copy of one generation.
  • control is allowed to be done between 120 minutes and 121 minutes and the management can be performed every minute.
  • the tolerance may be set up in a unit of predetermined number of images or in a unit of predetermined amount of data.
  • the count is decremented by one in essential each time that the move operation is carried out once and a reproduction signal is sent to the external recording apparatus.
  • the copy control information signal designates “no more copies”
  • the copy control information can be changed to “copy one generation” and delivered and when recording is carried out with the external recording apparatus, the copy control information can be changed to “no more copies”.
  • the count can be decremented by one and then delivered.
  • the control signal can be delivered, thus disabling any more move.
  • the apparatus on the reproduction signal transmitting side must have the erase function conforming to move as will be described later.
  • a control signal indicative of the erase function may be transmitted to the external recording apparatus.
  • the manner of management of the playback count matters in the event that, for example, an interruption occurs on the way of playback.
  • a method is available according to which the management is carried out in a unit of contents and after playback has proceeded for a constant time, the count is decremented by one.
  • the count may be decremented by one.
  • the count may be decremented by one.
  • the count may be decremented by one.
  • a description concerning the playback longevity period 317 will be given.
  • the playback permission period stops or ends before the program comes to an end
  • the reproduction output operation can be inhibited but otherwise, delivery of the reproduction output can continue to the end unless the playback operation is stopped. In the latter case, one playback operation can be carried out unless the playback longevity period has already expired at the time that the playback starts.
  • Information for the above purposes can be detected during playback by means of the information detection circuit 111 of FIG. 6.
  • the information can be rewritten by means of, for example, the signal output circuit 106 of FIG. 6. This can further promote the working condition management.
  • a unit of information to be erased is considered. It is first conceivable that when the period runs out, an erase operation is carried out in a unit of frame. It is also conceivable that the information is managed in a unit of larger time. For example, the management at the rate of one minute is carried out and information confined within one minute until the expiration is erased collectively. Alternatively, the management is carried out in a unit of plural image frames and information confined within a prescribed time until the expiration may be erased collectively. A similar operation may be undertaken at the rate of predetermined amount of data.
  • Timing of erase will be considered. As described above, the method is available according to which the erase timing linking to the retention period and playback permission period in some ways is determined. In addition to this, it is conceivable that when information once subjected to playback is not permitted for repetitive playback, the information is erased at a timing of playback even if the playback timing far precedes the effective period. In the event that the medium is removed form the apparatus at the expiration of the period and erase cannot be fulfilled, erase operation may be carried out when the medium is mounted subsequently.
  • information moved to the next medium is erased in a unit of frame.
  • the information may be managed in a unit of larger time. For example, when the information is managed every minute, information confined within one minute after move may be erased collectively.
  • the information may be managed in a unit of plural image frames and information confined within a prescribed time may be erased collectively. A similar operation may be performed at the rate of predetermined amount of data. Further, after one program has completed copying to the next medium, the whole of the program may be erased collectively.
  • FIG. 14 is a block diagram showing another embodiment of the information reproducing apparatus according to the invention.
  • the block diagram of the reproducing circuit shown in FIG. 6 is unified with the block diagram of the circuit shown in FIG. 4, additionally having a media type detection circuit 207 .
  • the reproducing circuit construction as shown in FIG. 7 or 12 can be used in place of the FIG. 6 reproducing circuit.
  • FIG. 14 is adapted to a disc medium.
  • the disc medium is sorted into an RW (or RAM) type capable of rewriting records many times and an R type incapable of rewriting information once recorded.
  • the term “un-rewritable” means “un-erasable” and if erase is to be applied or move is to be carried out after the expiration of the presupposed effective period, recording onto the R type disc medium must be rejected initially.
  • the media type detection circuit 207 is provided for this purpose.
  • a control signal is sent to the recording signal processing circuit 203 to prevent delivery of a code to be recorded.
  • some methods have been known which are directed to reading a sign applied outside a recording area of the medium, reading a code precedently recorded at part of the recording area and making a decision on the basis of reflection factor, respectively.
  • the output of the output control circuit 112 on the reproducing side is also fed to the recording signal processing circuit 203 .
  • the output control circuit 112 On the basis of the previously-described retention period and playback permission period or at the time that move proceeds, the output control circuit 112 generates a control signal for commanding an erase operation. Responsive to this control signal, the recording signal processing circuit 203 generates a code for performing erase at a location of interest on the medium.
  • This code can be a code that is meaningless as information.
  • the method is available which manages data in a unit of frame and erases the whole of data. This method is, however, sometimes unpractical from the viewpoint of the time for processing. Even in the case of the management in a unit of frame, the object can be attained sufficiently by erasing only the control signal part as shown in FIG. 8 for instance or especially erasing only the encryption information 309 in the control signal part.
  • the scramble information is recorded collectively at a single location on the medium. This information is reproduced collectively during reproduction inclusive of move, stored at a specified location in the memory circuit 104 and erased from the medium. If the reproduction is stopped on the way, an operation for recording again a control signal for a portion not played back onto the medium is carried out to simplify the erase process.
  • the whole or at least part of the area for storage of the information in the memory circuit 104 may preferably be implemented with a non-volatile memory circuit such as a flash memory.
  • the whole of the program may be erased collectively through the method as above after the move operation has stopped.
  • a unit dedicated to reproduction such as a CD-ROM drive does not have the recording circuit block corresponding to the lower half in FIG. 14 but if having a component corresponding to the recording signal processing circuit 203 having the function of generating the code for erase, it can operate similarly in terms of circuitry.
  • An apparatus using a hard disc as recording medium can of course dispense with the aforementioned media type detection circuit 207 .
  • FIG. 15 is a block diagram showing another embodiment of the information reproducing apparatus according to the invention.
  • an erasing device 115 is added to the block diagram of the reproducing circuit shown in FIG. 6.
  • the reproducing circuit construction in FIG. 7 or 12 can of course substitute for the circuit shown in FIG. 6.
  • the FIG. 15 embodiment is suitable for the tape medium.
  • the erasing device 115 is for this purpose and practically implemented with an erase head.
  • the output control circuit 112 sends a control signal to the erasing device 115 to decide whether an erase operation is performed. For example, when the retention period and playback permission period are prescribed, an erase operation is sometimes carried out following reproduction.
  • the full erase head If used, it must be mounted to a position for erase after scanning of the video head in contrast to the normal position. If the flying erase head or an unused video head is used as the erasing device, it must also be mounted to a position succeeding the reproducing head in the course of tape scanning. In the latter case, if the mount position satisfies the above condition accidentally but if not so, the height must be changed. Even in the former case, it is necessary to change the height or to mount another head.
  • the information to be recorded is digital information and differing from analog information, any problem in quality does not arise when erase is carried out using a DC magnetic field without using an AC magnetic field. Practically, when erase is carried out while performing reproduction, interference due to magnetic induction from the erase head to the reproducing head is difficult to prevent. But this problem can be solved using DC.
  • the erasing device can be constructed of a permanent magnet. But, a mechanism is needed which moves the location when the erase operation is not done and besides tension applied to the tape changes depending on whether or not erase is carried out, thereby raising a problem that the mechanism is difficult to control. In such an event, the aforementioned head may preferably be used as an electromagnet.
  • the information to which a stringent copy limit is set can be recorded temporarily by prescribing the retention period and playback permission period. Further, since the playback period is limited, the copyright holders can protect their right. In other words, compatibility between profits of the user and the copyright holder can be met. Further, by erasing the information when the period expires, security against unauthorized copying can be assured to advantage. In addition, the information can be erased collectively in a unit of time or data amount or only specified part of the recording information can be erased to simplify the erase process to advantage.
  • the erase process can advantageously be simplified.
  • the management of working conditions can further be promoted.

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US09/982,291 US20030077074A1 (en) 2000-12-13 2001-10-19 Digital information recording apparatus, reproducing apparatus and transmitting apparatus
US11/834,350 US8311389B2 (en) 2000-12-13 2007-08-06 Digital information recording apparatus, reproducing apparatus and transmitting apparatus
US13/649,882 US9083942B2 (en) 2000-12-13 2012-10-11 Digital information recording apparatus, reproducing apparatus and transmitting apparatus
US14/713,515 US9773522B2 (en) 2000-12-13 2015-05-15 Digital information recording apparatus, reproducing apparatus and transmitting apparatus
US15/690,640 US10529372B2 (en) 2000-12-13 2017-08-30 Digital information recording apparatus, reproducing apparatus and transmitting apparatus
US16/703,071 US10854237B2 (en) 2000-12-13 2019-12-04 Digital information recording apparatus, reproducing apparatus and transmitting apparatus
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US20150340059A1 (en) 2015-11-26
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US20200105300A1 (en) 2020-04-02
US20210104258A1 (en) 2021-04-08

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