GB8800029D0 - Recording of information signal - Google Patents

Recording of information signal

Info

Publication number
GB8800029D0
GB8800029D0 GB888800029A GB8800029A GB8800029D0 GB 8800029 D0 GB8800029 D0 GB 8800029D0 GB 888800029 A GB888800029 A GB 888800029A GB 8800029 A GB8800029 A GB 8800029A GB 8800029 D0 GB8800029 D0 GB 8800029D0
Authority
GB
United Kingdom
Prior art keywords
recording
information signal
information
signal
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.)
Pending
Application number
GB888800029A
Other versions
GB2199689A (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.)
KEEN A
Keen P D
Original Assignee
KEEN A
Keen P D
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
Priority claimed from GB878700070A external-priority patent/GB8700070D0/en
Application filed by KEEN A, Keen P D filed Critical KEEN A
Publication of GB8800029D0 publication Critical patent/GB8800029D0/en
Priority claimed from EP88305984A external-priority patent/EP0348570A1/en
Publication of GB2199689A publication Critical patent/GB2199689A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • G11B20/00731—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving a digital rights management system for enforcing a usage restriction
    • G11B20/00818—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving a digital rights management system for enforcing a usage restriction wherein the usage restriction limits the signal quality, e.g. by low-pass filtering of audio signals or by reducing the resolution of video signals
    • G11B20/00826—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving a digital rights management system for enforcing a usage restriction wherein the usage restriction limits the signal quality, e.g. by low-pass filtering of audio signals or by reducing the resolution of video signals wherein a spoiler signal is added to degrade the signal quality
    • 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)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Signal Processing Not Specific To The Method Of Recording And Reproducing (AREA)
GB08800029A 1987-01-05 1988-01-04 Recording of an information signal Pending GB2199689A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB878700070A GB8700070D0 (en) 1987-01-05 1987-01-05 Recording of information signal
EP88305984A EP0348570A1 (en) 1988-06-29 1988-06-29 A recording of an information signal

Publications (2)

Publication Number Publication Date
GB8800029D0 true GB8800029D0 (en) 1988-02-10
GB2199689A GB2199689A (en) 1988-07-13

Family

ID=26116445

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08800029A Pending GB2199689A (en) 1987-01-05 1988-01-04 Recording of an information signal

Country Status (1)

Country Link
GB (1) GB2199689A (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1005310C2 (en) * 1997-02-18 1998-08-20 Commanditaire Vennootschap C V Method of copy-protecting an audio signal.
NL1015587C2 (en) * 2000-07-03 2002-01-04 Johannes Henricus Mari Heijden Information carrier, in particular music carrier.
GB2390247B (en) 2002-06-28 2006-04-12 Dwight Cavendish Systems Ltd An improved method and apparatus for providing an anti-copy video signal
WO2004066295A1 (en) * 2003-01-22 2004-08-05 Darknoise Techonolgies Limited Digital content protection
GB0312985D0 (en) 2003-06-05 2003-07-09 Dwight Cavendish Systems Ltd Digital processing disruption systems
GB2419220B (en) 2004-10-13 2009-06-03 Dwight Cavendish Systems Ltd Audio copy protection system
US7986795B2 (en) 2007-02-09 2011-07-26 Wing Hon Tsang Method and apparatus for protecting media content against unauthorized duplication

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4086634A (en) * 1975-07-30 1978-04-25 Cook Laboratories, Inc. Method and apparatus for preparing recorded program material to prevent unauthorized duplication by magnetic tape recording
FR2459532B1 (en) * 1979-06-18 1987-07-31 Quadrivium Tech Avancees METHOD FOR ASSOCIATING AUXILIARY INFORMATION WITH RECORDED MAIN INFORMATION AND APPLICATION TO THE CONTROL OF THE REPRODUCTION OF RECORDED INFORMATION
GB2104701B (en) * 1981-08-06 1985-06-05 James Bertram King Method and apparatus for preventing unauthorised recording of source material (eg, a gramophone recording)
GB8418741D0 (en) * 1984-07-23 1984-08-30 Keen P D Audio and video recording technique

Also Published As

Publication number Publication date
GB2199689A (en) 1988-07-13

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