GB2396767A8 - Inserting positive-going pulses to back porch of a video signal for copy protection - Google Patents

Inserting positive-going pulses to back porch of a video signal for copy protection

Info

Publication number
GB2396767A8
GB2396767A8 GB0407606A GB0407606A GB2396767A8 GB 2396767 A8 GB2396767 A8 GB 2396767A8 GB 0407606 A GB0407606 A GB 0407606A GB 0407606 A GB0407606 A GB 0407606A GB 2396767 A8 GB2396767 A8 GB 2396767A8
Authority
GB
United Kingdom
Prior art keywords
video signal
copy protection
back porch
going pulses
inserting positive
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.)
Granted
Application number
GB0407606A
Other versions
GB2396767A (en
GB0407606D0 (en
GB2396767B8 (en
GB2396767B (en
Inventor
Arie Wijnen
Baolin Tan
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.)
Dwight Cavendish Systems Ltd
Original Assignee
Dwight Cavendish Systems Ltd
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 Dwight Cavendish Systems Ltd filed Critical Dwight Cavendish Systems Ltd
Priority to GB0407606A priority Critical patent/GB2396767B8/en
Publication of GB0407606D0 publication Critical patent/GB0407606D0/en
Publication of GB2396767A publication Critical patent/GB2396767A/en
Application granted granted Critical
Publication of GB2396767B publication Critical patent/GB2396767B/en
Publication of GB2396767A8 publication Critical patent/GB2396767A8/en
Publication of GB2396767B8 publication Critical patent/GB2396767B8/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • H04N5/765—Interface circuits between an apparatus for recording and another apparatus
    • H04N5/775—Interface circuits between an apparatus for recording and another apparatus between a recording apparatus and a television receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/765—Interface circuits between an apparatus for recording and another apparatus
    • H04N5/775—Interface circuits between an apparatus for recording and another apparatus between a recording apparatus and a television receiver
    • H04N5/7755—Interface circuits between an apparatus for recording and another apparatus between a recording apparatus and a television receiver the recorder being connected to, or coupled with, the antenna of the television receiver
GB0407606A 2002-02-01 2002-02-01 Anti-copy protection for a video signal Expired - Fee Related GB2396767B8 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0407606A GB2396767B8 (en) 2002-02-01 2002-02-01 Anti-copy protection for a video signal

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0202384A GB2387497B (en) 2002-02-01 2002-02-01 Anti-copy protection for a video signal
GB0407606A GB2396767B8 (en) 2002-02-01 2002-02-01 Anti-copy protection for a video signal

Publications (5)

Publication Number Publication Date
GB0407606D0 GB0407606D0 (en) 2004-05-05
GB2396767A GB2396767A (en) 2004-06-30
GB2396767B GB2396767B (en) 2004-09-08
GB2396767A8 true GB2396767A8 (en) 2005-03-15
GB2396767B8 GB2396767B8 (en) 2005-03-15

Family

ID=9930239

Family Applications (2)

Application Number Title Priority Date Filing Date
GB0407606A Expired - Fee Related GB2396767B8 (en) 2002-02-01 2002-02-01 Anti-copy protection for a video signal
GB0202384A Expired - Fee Related GB2387497B (en) 2002-02-01 2002-02-01 Anti-copy protection for a video signal

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB0202384A Expired - Fee Related GB2387497B (en) 2002-02-01 2002-02-01 Anti-copy protection for a video signal

Country Status (2)

Country Link
GB (2) GB2396767B8 (en)
WO (1) WO2003065716A2 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2390247B (en) 2002-06-28 2006-04-12 Dwight Cavendish Systems Ltd An improved method and apparatus for providing an anti-copy video signal
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
US8428258B2 (en) 2007-05-02 2013-04-23 Rovi Technologies Corporation Method and apparatus for providing content control via detection of modifications to a signal
US8306403B2 (en) 2010-03-29 2012-11-06 Rovi Technologies Corporation Content control via guide data and/or metadata

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6052625B2 (en) * 1976-03-22 1985-11-20 ソニー株式会社 Recorded recording medium and its production method
JPS52114313A (en) * 1976-03-23 1977-09-26 Sony Corp Recorded medium and production method therefor
US4571642A (en) * 1981-08-24 1986-02-18 Hofstein Steven R Method of and apparatus for modifying a video signal to prevent the unauthorized recording and reproduction thereof
US4631603A (en) * 1985-04-17 1986-12-23 Macrovision Method and apparatus for processing a video signal so as to prohibit the making of acceptable video tape recordings thereof
SE458081B (en) * 1986-09-24 1989-02-20 Conny Togeretz PROCEDURE TO PREVENT UNDERTAKING COPY OF THE CONTENT OF VIDEO TAPE AND DEVICE BEFORE IMPLEMENTATION OF THE PROCEDURE
JPS63228888A (en) * 1987-03-18 1988-09-22 Shinano Kikaku:Kk Recorded video tape and its production
JPH11503282A (en) * 1995-04-07 1999-03-23 トレヴァー フランクリン Method and apparatus for processing video signals
US5737417A (en) * 1995-04-24 1998-04-07 Technicolor Videocassette, Inc. Videotape anti-copying encryption scheme
US6188832B1 (en) * 1997-05-07 2001-02-13 Microvision Corp Method and apparatus for modifications made to a video signal to inhibit the making of acceptable videotape recordings
US6404889B1 (en) * 1997-06-30 2002-06-11 Macrovision Corporation Protection of a component video signal

Also Published As

Publication number Publication date
GB2396767A (en) 2004-06-30
GB0407606D0 (en) 2004-05-05
GB2396767B8 (en) 2005-03-15
WO2003065716A2 (en) 2003-08-07
WO2003065716A3 (en) 2003-12-31
GB0202384D0 (en) 2002-03-20
GB2396767B (en) 2004-09-08
GB2387497B (en) 2004-12-08
GB2387497A (en) 2003-10-15

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Legal Events

Date Code Title Description
711B Application made for correction of error (sect. 117/77)
711G Correction allowed (sect. 117/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20060201

728Y Application for restoration allowed (sect. 28/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20080201