GB8617502D0 - Preventing magnetic recording from reproduction - Google Patents

Preventing magnetic recording from reproduction

Info

Publication number
GB8617502D0
GB8617502D0 GB868617502A GB8617502A GB8617502D0 GB 8617502 D0 GB8617502 D0 GB 8617502D0 GB 868617502 A GB868617502 A GB 868617502A GB 8617502 A GB8617502 A GB 8617502A GB 8617502 D0 GB8617502 D0 GB 8617502D0
Authority
GB
United Kingdom
Prior art keywords
reproduction
magnetic recording
preventing magnetic
preventing
recording
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB868617502A
Other versions
GB2178574A (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TDK Corp
Original Assignee
TDK Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by TDK Corp filed Critical TDK Corp
Publication of GB8617502D0 publication Critical patent/GB8617502D0/en
Publication of GB2178574A publication Critical patent/GB2178574A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F12/00—Accessing, addressing or allocating within memory systems or architectures
    • G06F12/14—Protection against unauthorised use of memory or access to memory
    • 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
    • G11B20/00572—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which change the format of the recording medium
    • G11B20/00586—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which change the format of the recording medium said format change concerning the physical format of the recording medium
    • G11B20/00594—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which change the format of the recording medium said format change concerning the physical format of the recording medium wherein the shape of recording marks is altered, e.g. the depth, width, or length of pits
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Computer Hardware Design (AREA)
  • Software Systems (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)
GB08617502A 1985-07-27 1986-07-17 Preventing copying of a magnetic recording Withdrawn GB2178574A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP60166147A JPH0673221B2 (en) 1985-07-27 1985-07-27 Method for preventing duplication of magnetic recording medium

Publications (2)

Publication Number Publication Date
GB8617502D0 true GB8617502D0 (en) 1986-08-28
GB2178574A GB2178574A (en) 1987-02-11

Family

ID=15825923

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08617502A Withdrawn GB2178574A (en) 1985-07-27 1986-07-17 Preventing copying of a magnetic recording

Country Status (4)

Country Link
JP (1) JPH0673221B2 (en)
KR (1) KR910004627B1 (en)
DE (1) DE3625176A1 (en)
GB (1) GB2178574A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU6948491A (en) * 1990-01-20 1991-07-25 Consolidated Technology Limited Copy protection for memory devices
CN1280815C (en) * 1994-04-18 2006-10-18 松下电器产业株式会社 Information processor
JP3004850U (en) * 1994-05-19 1994-11-29 有限会社カートップトミタ Vehicle inventory information system
US9135948B2 (en) * 2009-07-03 2015-09-15 Microsoft Technology Licensing, Llc Optical medium with added descriptor to reduce counterfeiting

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5960464A (en) * 1982-09-30 1984-04-06 株式会社東芝 Program ciphering system
IL68989A (en) * 1983-06-15 1985-03-31 Amiran Grynberg Diskette protection
GB2162992B (en) * 1984-08-09 1988-10-12 Edward Peter Campbell Sington A method of recording a computer program
US4823210A (en) * 1984-08-13 1989-04-18 Verbatim Corporation Copy protected disk
US4644493A (en) * 1984-09-14 1987-02-17 International Business Machines Corporation Implementing a shared higher level of privilege on personal computers for copy protection of software
JPH0616345B2 (en) * 1984-12-19 1994-03-02 ティーディーケイ株式会社 Method of discriminating duplicated product of magnetic recording medium, apparatus therefor, and method of preventing duplicated product reading

Also Published As

Publication number Publication date
KR910004627B1 (en) 1991-07-08
JPS6226671A (en) 1987-02-04
DE3625176A1 (en) 1987-01-29
JPH0673221B2 (en) 1994-09-14
KR870001528A (en) 1987-03-14
GB2178574A (en) 1987-02-11

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)