CA2158021A1 - Copy protection for hybrid digital video tape recording and unprotected source material - Google Patents

Copy protection for hybrid digital video tape recording and unprotected source material

Info

Publication number
CA2158021A1
CA2158021A1 CA002158021A CA2158021A CA2158021A1 CA 2158021 A1 CA2158021 A1 CA 2158021A1 CA 002158021 A CA002158021 A CA 002158021A CA 2158021 A CA2158021 A CA 2158021A CA 2158021 A1 CA2158021 A1 CA 2158021A1
Authority
CA
Canada
Prior art keywords
copy
analog
digital
video
input
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
CA002158021A
Other languages
French (fr)
Other versions
CA2158021C (en
Inventor
John O. Ryan
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.)
Rovi Corp
Original Assignee
John O. Ryan
Macrovision Corporation
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=21867426&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=CA2158021(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by John O. Ryan, Macrovision Corporation filed Critical John O. Ryan
Publication of CA2158021A1 publication Critical patent/CA2158021A1/en
Application granted granted Critical
Publication of CA2158021C publication Critical patent/CA2158021C/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • G11B20/10—Digital recording or reproducing
    • 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
    • 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
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2211/00—Indexing scheme relating to details of data-processing equipment not covered by groups G06F3/00 - G06F13/00
    • G06F2211/007—Encryption, En-/decode, En-/decipher, En-/decypher, Scramble, (De-)compress
    • 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

Abstract

A hybrid digital/analog video recorder prevents both analog and digital copying. The recorder (including a digital tape deck) inputs and outputs both analog and digital video signals. At the analog input, a detector detects conventional copy protection in the analog input video, and in response disables recording thereof. At the digital input, a first detector detects anti-copy bits present in the input material and in response prevents recording. A second bit detector detects serial copy prevention scheme bits, and in response adds an anti-copy bit to the input digital stream, preventing later copying of such material. When another bit detector detects anti-copy bits present in the playback digital data stream prior to conversion to analog, an analog copy protection signal modifies the output analog signal, inhibiting copying of the output signal. In another version, a specially adapted video recorder or playback device copy protects video source material which for technical reasons is not copy protectable. A copy protect "flag" is provided in a predetermined location in the video signal to be protected.
The video recorder or playback device, upon detection of the flag at playback, modifies the output standard (NTSC) video signal with a conventional copy protection process.
CA002158021A 1993-03-18 1994-03-04 Copy protection for hybrid digital video tape recording and unprotected source material Expired - Lifetime CA2158021C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US08/032,894 US5315448A (en) 1993-03-18 1993-03-18 Copy protection for hybrid digital video tape recording and unprotected source material
US032,894 1993-03-18
PCT/US1994/002351 WO1994022266A2 (en) 1993-03-18 1994-03-04 Copy protection for hybrid digital video tape recording and unprotected source material

Publications (2)

Publication Number Publication Date
CA2158021A1 true CA2158021A1 (en) 1994-09-29
CA2158021C CA2158021C (en) 2003-05-13

Family

ID=21867426

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002158021A Expired - Lifetime CA2158021C (en) 1993-03-18 1994-03-04 Copy protection for hybrid digital video tape recording and unprotected source material

Country Status (18)

Country Link
US (1) US5315448A (en)
EP (1) EP0689751B1 (en)
JP (1) JP2895629B2 (en)
KR (1) KR100306005B1 (en)
CN (4) CN1292589C (en)
AT (1) ATE182731T1 (en)
AU (1) AU677999B2 (en)
BR (1) BR9406002A (en)
CA (1) CA2158021C (en)
DE (1) DE69419739T2 (en)
ES (1) ES2133547T3 (en)
HK (2) HK1013757A1 (en)
HU (1) HU221769B1 (en)
MY (1) MY110468A (en)
NZ (1) NZ263049A (en)
PL (1) PL173292B1 (en)
RU (1) RU2139639C1 (en)
WO (1) WO1994022266A2 (en)

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CN1122177A (en) 1996-05-08
CN1523882A (en) 2004-08-25
NZ263049A (en) 1997-11-24
CN1143531C (en) 2004-03-24
WO1994022266A3 (en) 1995-01-19
WO1994022266A2 (en) 1994-09-29
KR100306005B1 (en) 2002-07-08
RU2139639C1 (en) 1999-10-10
HK1099873A1 (en) 2007-08-24
JP2895629B2 (en) 1999-05-24
HUT73989A (en) 1996-10-28
AU677999B2 (en) 1997-05-15
DE69419739D1 (en) 1999-09-02
HK1013757A1 (en) 1999-09-03
ES2133547T3 (en) 1999-09-16
ATE182731T1 (en) 1999-08-15
CN1921601B (en) 2011-04-06
PL310623A1 (en) 1995-12-27
HU9502657D0 (en) 1995-11-28
EP0689751A1 (en) 1996-01-03
DE69419739T2 (en) 1999-12-02
MY110468A (en) 1998-05-30
CN1292589C (en) 2006-12-27
HU221769B1 (en) 2003-01-28
PL173292B1 (en) 1998-02-27
JPH08507912A (en) 1996-08-20
KR960701446A (en) 1996-02-24
US5315448A (en) 1994-05-24
BR9406002A (en) 1996-01-02
CA2158021C (en) 2003-05-13
AU6359394A (en) 1994-10-11
CN1921601A (en) 2007-02-28
EP0689751B1 (en) 1999-07-28
CN102025958A (en) 2011-04-20

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