HK132993A - Method and apparatus for processing a video signal so as to prohibit the making of acceptable video tape recordings thereof - Google Patents

Method and apparatus for processing a video signal so as to prohibit the making of acceptable video tape recordings thereof

Info

Publication number
HK132993A
HK132993A HK1329/93A HK132993A HK132993A HK 132993 A HK132993 A HK 132993A HK 1329/93 A HK1329/93 A HK 1329/93A HK 132993 A HK132993 A HK 132993A HK 132993 A HK132993 A HK 132993A
Authority
HK
Hong Kong
Prior art keywords
video signal
pulses
pseudo
sync pulses
level
Prior art date
Application number
HK1329/93A
Other languages
English (en)
Inventor
John Oliver Ryan
Original Assignee
Macrovision 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=24908568&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=HK132993(A) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Macrovision Corp filed Critical Macrovision Corp
Publication of HK132993A publication Critical patent/HK132993A/xx

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
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Television Signal Processing For Recording (AREA)
  • Signal Processing Not Specific To The Method Of Recording And Reproducing (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)
  • Management Or Editing Of Information On Record Carriers (AREA)
  • Television Systems (AREA)
  • Color Television Image Signal Generators (AREA)
HK1329/93A 1985-04-17 1993-12-02 Method and apparatus for processing a video signal so as to prohibit the making of acceptable video tape recordings thereof HK132993A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US06/724,006 US4631603A (en) 1985-04-17 1985-04-17 Method and apparatus for processing a video signal so as to prohibit the making of acceptable video tape recordings thereof

Publications (1)

Publication Number Publication Date
HK132993A true HK132993A (en) 1993-12-10

Family

ID=24908568

Family Applications (1)

Application Number Title Priority Date Filing Date
HK1329/93A HK132993A (en) 1985-04-17 1993-12-02 Method and apparatus for processing a video signal so as to prohibit the making of acceptable video tape recordings thereof

Country Status (17)

Country Link
US (1) US4631603A (xx)
EP (1) EP0199553B1 (xx)
JP (1) JPS61288582A (xx)
KR (1) KR930006529B1 (xx)
CN (1) CN1004115B (xx)
AT (1) ATE48732T1 (xx)
AU (1) AU577011B2 (xx)
CA (1) CA1256558A (xx)
DE (2) DE3667580D1 (xx)
ES (1) ES8800477A1 (xx)
HK (1) HK132993A (xx)
IE (1) IE57319B1 (xx)
IN (1) IN165570B (xx)
MX (1) MX163608B (xx)
NZ (1) NZ215693A (xx)
PH (1) PH23758A (xx)
ZA (1) ZA862491B (xx)

Families Citing this family (110)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5130810A (en) * 1983-11-23 1992-07-14 Macrovision Corporation Method and apparatus for processing a video signal so as to prohibit the making of acceptable videotape recordings
US4695901A (en) * 1986-03-04 1987-09-22 Macrovision Method and apparatus for removing pseudo-sync and/or agc pulses from a video signal
JPH0748845B2 (ja) * 1986-08-11 1995-05-24 株式会社日立製作所 磁気記録再生装置
US4937679A (en) * 1986-08-11 1990-06-26 Macrovision Dual deck video recording apparatus having enhanced copy protection and method for providing enhanced copy protection to such a recording apparatus
EP0267039A3 (en) * 1986-11-05 1990-04-04 Satellite Technology Services, Inc. Video system and method for controlled videotaping
JPS63228888A (ja) * 1987-03-18 1988-09-22 Shinano Kikaku:Kk 記録済ビデオテ−プとその作製方法
DE3855568T2 (de) * 1987-07-29 1997-02-06 Scitec Corp Methode für den Kopierschutz eines vorbespielten Videobandes
JP2512008B2 (ja) * 1987-09-21 1996-07-03 マクロビジョン・コーポレーション ビデオ信号から疑似同期パルスおよび／またはａｇｃパルスを除去する方法および装置
JPH0797855B2 (ja) * 1987-09-29 1995-10-18 株式会社日立製作所 磁気録画再生装置
US4914694A (en) * 1988-04-11 1990-04-03 Eidak Corporation Modifying a television signal to inhibit recording/reproduction
US4924498A (en) * 1988-04-29 1990-05-08 Scientific Atlanta, Inc. Method and apparatus for improving video scrambling and employing split snyc pulses
US5142575A (en) * 1988-04-29 1992-08-25 Scientific-Atlanta, Inc. Method and apparatus for improving video scrambling and employing split sync pulses
US4912691A (en) * 1988-08-01 1990-03-27 Raymond Jones Video stabilizer
DE8812594U1 (de) * 1988-10-04 1988-11-24 Ellerbrok, Ingrid, 1000 Berlin Vorschaltgerät für Videorecorder zum Löschen von Artefakten
US5673356A (en) * 1988-10-11 1997-09-30 Copyguard Enterprises S.A. Method and an apparatus for preventing unauthorized recording on tapes on video programs
US4951315A (en) * 1988-12-30 1990-08-21 Switsen Henry N Video signal noise evaluation and removal circuit
GB2231755B (en) * 1989-04-21 1993-10-06 Pioneer Electronic Corp Method for scrambling a television signal and method and apparatus for descrambling a scrambled television signal
US5177787A (en) * 1989-05-01 1993-01-05 Scientific-Atlanta, Inc Scrambler with self-calibration
JPH03167979A (ja) * 1989-11-28 1991-07-19 Hitachi Ltd 磁気記録再生装置
US5003590A (en) * 1989-12-18 1991-03-26 Eidak Corporation Encoding an optical video disc to inhibit video tape recording
JPH03125576U (xx) * 1990-03-29 1991-12-18
KR930006520B1 (ko) * 1991-04-19 1993-07-16 삼성전자 주식회사 복사방지 시스템
NL9000951A (nl) * 1990-04-20 1991-11-18 Copyguard Enterprises Werkwijze en toestel voor het verhinderen van het onrechtmatig op band overnemen van beeldsignalen.
US5177618A (en) * 1990-06-29 1993-01-05 Go-Video, Inc. Dual deck vcr and duplicating circuit therefor
JP2883449B2 (ja) * 1990-12-27 1999-04-19 株式会社東芝 記録装置
JPH04245063A (ja) * 1991-01-31 1992-09-01 Sony Corp 複製防止用の信号合成回路並びに検出回路
US5402488A (en) * 1991-08-30 1995-03-28 Karlock; James A. Method and apparatus for modifying a video signal
US5155767A (en) * 1991-11-12 1992-10-13 Noller Robert R Method and apparatus for manufacturing pre-recorded videotape programs
KR940008492B1 (ko) * 1992-03-23 1994-09-15 삼성전자 주식회사 문자발생회로의 오동작 방지회로
TW221507B (xx) * 1992-06-16 1994-03-01 Matsushita Electric Ind Co Ltd
JPH0644755A (ja) * 1992-07-24 1994-02-18 Sony Corp ビデオ信号の伝送方法及び記録装置
JP3217137B2 (ja) * 1992-07-28 2001-10-09 株式会社日立製作所 映像信号記録装置、再生装置及び伝送装置
US5394470A (en) * 1992-08-24 1995-02-28 Eidak Corporation Horizontal pulse augmentation of a video signal
US5315448A (en) * 1993-03-18 1994-05-24 Macrovision Corporation Copy protection for hybrid digital video tape recording and unprotected source material
US5583936A (en) * 1993-05-17 1996-12-10 Macrovision Corporation Video copy protection process enhancement to introduce horizontal and vertical picture distortions
US5825969A (en) 1994-02-18 1998-10-20 Hitachi, Ltd. Information management apparatus for inhibiting reproduction in a video cassette recorder
JP3319141B2 (ja) * 1994-03-27 2002-08-26 ソニー株式会社 画像信号処理装置
JP3329063B2 (ja) * 1994-03-29 2002-09-30 ソニー株式会社 再生装置
JP2959413B2 (ja) * 1994-09-29 1999-10-06 日本ビクター株式会社 ダビング装置
JP3072699B2 (ja) 1994-10-25 2000-07-31 ソニー株式会社 ディジタル映像装置
SG34287A1 (en) * 1994-10-28 1996-12-06 Hitachi Ltd Input-output circuit recording apparatus and reproduction apparatus for digital video signal
CN1912885B (zh) * 1995-02-13 2010-12-22 英特特拉斯特技术公司 用于安全交易管理和电子权利保护的系统和方法
US5661801A (en) * 1995-02-14 1997-08-26 Hsn Marketing Inc. Method and apparatus for stabilizing and brightening prerecorded TV signals encoded with copy protection
WO1996031878A1 (en) * 1995-04-07 1996-10-10 Trevor Franklin Method and apparatus for treating a video signal
US5737417A (en) * 1995-04-24 1998-04-07 Technicolor Videocassette, Inc. Videotape anti-copying encryption scheme
US6163644A (en) 1995-04-27 2000-12-19 Hitachi, Ltd. Method and apparatus for receiving and/or reproducing digital signal
EP0824825B1 (en) * 1995-05-09 2001-10-17 Macrovision Corporation Method and apparatus for defeating effects of color burst modifications to a video signal
US6516132B1 (en) * 1995-05-09 2003-02-04 Macrovision Corp Method and apparatus for improving the effects of color burst modifications to a video signal
US6327422B1 (en) * 1997-07-18 2001-12-04 Macrovision Corp Method and apparatus for modifying the effects of color burst modifications to a video signal
US7065211B1 (en) * 1995-07-21 2006-06-20 Sony Corporation Signal reproducing/recording/transmitting method and apparatus and signal recording medium
US6980653B1 (en) * 1995-07-21 2005-12-27 Sony Corporation Signal reproducing/recording/transmitting method and apparatus and signal record medium
CA2234971C (en) * 1995-10-17 2001-08-07 Macrovision Corporation Method and apparatus for removing or defeating effects of copy protection signals from a video signal
JP3430750B2 (ja) * 1995-10-27 2003-07-28 ソニー株式会社 ビデオ信号のコピーガード装置および方法
KR19990076944A (ko) * 1996-01-03 1999-10-25 밀러 제리 에이 복제 보호 기록 및 재생 시스템
WO1997037492A1 (en) * 1996-04-01 1997-10-09 Macrovision Corporation A method for controlling copy protection in digital video networks
NZ332289A (en) * 1996-05-08 2000-07-28 Macrovision Corp Apparatus for modifications made to a video signal to inhibit the making of acceptable videotape recordings
EP0913055B1 (en) * 1996-07-19 2000-05-31 Macrovision Corporation Method of adaptive control of the presence of a copy protection signal
US6058191A (en) * 1997-02-04 2000-05-02 Macrovision Corp Method and apparatus for modifying the envelope of a RF carrier signal to remove copy protection signals therefrom
US7395545B2 (en) * 1997-03-31 2008-07-01 Macrovision Corporation Method and apparatus for providing copy protection using a transmittal mode command
JPH10285530A (ja) * 1997-04-04 1998-10-23 Sony Corp コピーガード状態通知方法および映像信号処理装置
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
US6411713B1 (en) 1997-07-16 2002-06-25 Macrovision Corporation Method of adaptive control of the presence of a copy protection signal
US6459795B1 (en) * 1998-02-26 2002-10-01 Macrovision Corporation Method and apparatus for enhancing the scrambling of a TV signal via erroneous clamp signals
US6272283B1 (en) 1998-04-22 2001-08-07 Neomagic Corp. Copy-protection for laptop PC by disabling TV-out while viewing protected video on PC display
US6701062B1 (en) * 1998-06-06 2004-03-02 Macrovision Corporation Generational copy control of a video signal
AU3841599A (en) * 1998-06-06 1999-12-30 Koninklijke Philips Electronics N.V. Generational copy control of a digital video signal
US6836549B1 (en) * 1998-09-02 2004-12-28 Macrovision Corporation Method and apparatus for synthesizing and reducing the effects of video copy protection signals
ATE273595T1 (de) * 1998-09-02 2004-08-15 Macrovision Corp Verfahren und anlage zum herstellen und unwirksam machen von videokopierschutzsignalen
EP1480455A1 (en) 1998-09-02 2004-11-24 Macrovision Corporation Method and apparatus of synthesizing copy protection signals in a video signal
EP1145430B1 (en) * 1998-11-12 2004-09-15 Broadcom Corporation Integrated tuner architecture
WO2000042763A2 (en) * 1999-01-15 2000-07-20 Macrovision Corporation Method and apparatus for scrambling a high definition television signal
CN1282361C (zh) * 1999-02-25 2006-10-25 麦克罗维西恩公司 标记视频或音频信号的方法、视频或音频机顶盒和记录器
US6826352B1 (en) 2000-03-29 2004-11-30 Macrovision Corporation Dynamic video copy protection system
US6842522B1 (en) * 2000-06-01 2005-01-11 Macrovision Corporation Secure digital video disk and player
US6865337B1 (en) 2000-08-08 2005-03-08 Conexant Systems, Inc. System and method for detecting modifications of video signals designed to prevent copying by traditional video tape recorders
US7050698B1 (en) * 2000-08-15 2006-05-23 Macrovision Corporation Method and apparatus for synthesizing or modifying a copy protection signal using a lowered signal level portion
JP2002112284A (ja) * 2000-09-27 2002-04-12 Kuriputon:Kk 映像録画の複製防止システム
US6931547B2 (en) * 2001-01-03 2005-08-16 Macrovision Corporation Method and apparatus for identifying a vertical blanking interval in a television signal
US20050111661A1 (en) * 2002-02-01 2005-05-26 Arie Wijnen Anti-copy protection for a video signal
GB2387497B (en) * 2002-02-01 2004-12-08 Dwight Cavendish Systems Ltd Anti-copy protection for a video signal
GB2390247B (en) 2002-06-28 2006-04-12 Dwight Cavendish Systems Ltd An improved method and apparatus for providing an anti-copy video signal
US7398008B2 (en) * 2002-09-19 2008-07-08 Hewlett-Packard Development Company, L.P. Copy protection for analog video signals from computing devices
GB0312985D0 (en) 2003-06-05 2003-07-09 Dwight Cavendish Systems Ltd Digital processing disruption systems
JP4424929B2 (ja) * 2003-07-15 2010-03-03 パイオニア株式会社 情報記録媒体、情報再生装置及び情報再生方法
US7865057B2 (en) * 2003-10-07 2011-01-04 Rovi Solutions Corporation Method and apparatus for conveying rights across an analog video interface
GB2419220B (en) 2004-10-13 2009-06-03 Dwight Cavendish Systems Ltd Audio copy protection system
US7784103B2 (en) 2004-10-19 2010-08-24 Rovi Solutions Corporation Method and apparatus for storing copy protection information separately from protected content
US7907727B2 (en) * 2004-10-19 2011-03-15 Rovi Solutions Corporation System and method for allowing copying or distribution of a copy protected signal
WO2006050009A1 (en) * 2004-10-28 2006-05-11 Macrovision Corporation Content management for high definition television
CN100433819C (zh) * 2004-12-28 2008-11-12 河海大学常州校区 对模拟视频信号进行加扰处理的方法及加扰电路
US20060159423A1 (en) * 2005-01-19 2006-07-20 Guobiao Zhang Tamper-Proof Content-Playback System Offering Excellent Copyright Protection
US7792293B2 (en) * 2005-05-06 2010-09-07 Rovi Solutions Corporation Method and apparatus for modifying a subsequently generated control command in a content control system
US20080163053A1 (en) * 2006-12-28 2008-07-03 Samsung Electronics Co., Ltd. Method to provide menu, using menu set and multimedia device using the same
US8409270B2 (en) * 2007-04-16 2013-04-02 Boston Scientific Scimed, Inc. Radiopaque compositions, stents and methods of preparation
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
US20080309816A1 (en) * 2007-06-15 2008-12-18 Macrovision Corporation Television content control system and method with cross-platform capability
US8526794B2 (en) * 2007-08-22 2013-09-03 Rovi Solutions Corporation Method and apparatus for synthesizing a copy protection or content control signal with improved playability of a TV set
US20090225221A1 (en) * 2008-03-04 2009-09-10 Andrew Robert Gordon Flexible router
CN101562032B (zh) * 2008-04-15 2012-09-26 曾永汉 防护媒体内容被未经授权地复制的方法和设备
US8254470B2 (en) * 2008-06-03 2012-08-28 Rovi Solutions Corporation Encoding and decoding of embedded data stream in analog video using copy protection pulses
US8280049B2 (en) * 2008-08-27 2012-10-02 Rovi Solutions Corporation Method and apparatus for synthesizing copy protection for reducing/defeating the effectiveness or capability of a circumvention device
US7880990B2 (en) * 2008-12-10 2011-02-01 Hitachi Global Storage Technologies Netherlands B.V. Patterned-media magnetic recording disk with cryptographically scrambled patterns and disk drive operable with the disk
US10943030B2 (en) 2008-12-15 2021-03-09 Ibailbonding.Com Securable independent electronic document
US20100309380A1 (en) * 2009-06-05 2010-12-09 Macrovision Corporation Method and apparatus for providing and reducing dynamic chroma copy protection effects by modifying luminance copy protection signals
US8374489B2 (en) 2009-09-23 2013-02-12 Rovi Technologies Corporation Method and apparatus for inducing and or reducing geometric distortions in a display via positive going pulses
US20110081129A1 (en) 2009-10-07 2011-04-07 Rovi Technologies Corporation Broadband recording method and apparatus for video and/or audio programs
US20110135277A1 (en) * 2009-12-09 2011-06-09 Rovi Technologies Corporation Method and Apparatus for Providing in a Receiver a Copy Protection Signal That Negates a Circumvention Device and or Provides Improved Playability
US8374490B2 (en) * 2010-02-24 2013-02-12 Rovi Technologies Corporation Method and apparatus for receiving metadata, EPG, or IPG signals in an integrated circuit for control purposes
US8306403B2 (en) * 2010-03-29 2012-11-06 Rovi Technologies Corporation Content control via guide data and/or metadata
US9049073B2 (en) 2011-06-28 2015-06-02 Rovi Guides, Inc. Systems and methods for initializing allocations of transport streams based on historical data

Family Cites Families (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3018324A (en) * 1958-07-25 1962-01-23 Rca Corp Stabilization in tape recording and reproduction
US3059052A (en) * 1960-11-28 1962-10-16 Ampex Signal generator
GB1068881A (en) * 1964-04-07 1967-05-17 R & R Res Ltd Improvements in and relating to television apparatus
US3530232A (en) * 1966-06-17 1970-09-22 Intern Telemeter Corp Subscription television system
US4030128A (en) * 1974-11-21 1977-06-14 Bell & Howell Company Video record scrambling and unscrambling
US3963865A (en) * 1975-06-04 1976-06-15 Trans-American Video, Inc. Anti-piracy method and system
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
JPS6052625B2 (ja) * 1976-03-22 1985-11-20 ソニー株式会社 記録済記録媒体及びその作製方法
JPS52114313A (en) * 1976-03-23 1977-09-26 Sony Corp Recorded medium and production method therefor
US4121242A (en) * 1976-04-20 1978-10-17 Janko Mike A Video processor providing sync stripping and reinsertion
US4286281A (en) * 1978-09-30 1981-08-25 Pioneer Electronic Corporation Video format signal recording and reproducing device
US4213149A (en) * 1978-12-26 1980-07-15 Janko Mike A Apparatus for preventing video tape duplication
US4488183A (en) * 1980-10-27 1984-12-11 Victor Company Of Japan, Limited Copy-proof recording medium and device for adding copy-proof interference signal
US4439785A (en) * 1980-11-17 1984-03-27 Vvr Associates Subscriber television system
CA1153103A (en) * 1981-03-19 1983-08-30 Northern Telecom Limited Scrambling and unscrambling video signals in a pay tv system
US4488176A (en) * 1981-03-19 1984-12-11 Northern Telecom Limited Method of and apparatus for modifying a video signal to inhibit recording thereof
US4467358A (en) * 1982-02-09 1984-08-21 Switsen Henry N Video tape recorder signal processor
AU2494384A (en) * 1983-02-09 1984-08-30 Societe Internationale De Service A L'Exportation Dite Sisex & Specialites Electro Physiques Sep & Recherches Integrees Au Marketing Rim Device for the protection of magnetic tapes, or other recording media, or television or radio broadcasting against an authorized reading and/or reproduction
FR2549332B1 (fr) * 1983-07-12 1989-03-17 Labo Cent Telecommunicat Procede et dispositif pour empecher l'enregistrement non autorise d'un signal video de television
WO1985002293A1 (fr) * 1983-11-21 1985-05-23 Haute Securite Video Hsv S.A. Procede et dispositif anti-piraterie pour supports d'images cinematographiques et video
JPH0743825B2 (ja) * 1985-12-04 1995-05-15 ソニー株式会社 ダビング方式

Also Published As

Publication number Publication date
CN1004115B (zh) 1989-05-03
PH23758A (en) 1989-11-03
IN165570B (xx) 1989-11-18
ZA862491B (en) 1986-11-26
CN86102600A (zh) 1987-03-04
ES8800477A1 (es) 1987-10-16
KR860008685A (ko) 1986-11-17
JPH0544235B2 (xx) 1993-07-05
EP0199553B1 (en) 1989-12-13
US4631603A (en) 1986-12-23
EP0199553A3 (en) 1987-11-11
IE57319B1 (en) 1992-07-15
ES554085A0 (es) 1987-10-16
MX163608B (es) 1992-06-05
JPS61288582A (ja) 1986-12-18
EP0199553A2 (en) 1986-10-29
AU577011B2 (en) 1988-09-08
ATE48732T1 (de) 1989-12-15
DE199553T1 (de) 1989-04-20
DE3667580D1 (de) 1990-01-18
CA1256558A (en) 1989-06-27
AU5607786A (en) 1986-10-23
KR930006529B1 (ko) 1993-07-16
IE860992L (en) 1986-10-17
NZ215693A (en) 1989-01-06

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Effective date: 20060416