WO1988002588A1 - Procede servant a empecher la duplication non autorisee de cassettes video et appareil de realisation dudit procede - Google Patents

Procede servant a empecher la duplication non autorisee de cassettes video et appareil de realisation dudit procede Download PDF

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Publication number
WO1988002588A1
WO1988002588A1 PCT/SE1987/000426 SE8700426W WO8802588A1 WO 1988002588 A1 WO1988002588 A1 WO 1988002588A1 SE 8700426 W SE8700426 W SE 8700426W WO 8802588 A1 WO8802588 A1 WO 8802588A1
Authority
WO
WIPO (PCT)
Prior art keywords
signal
video
amplitude
recording
video signal
Prior art date
Application number
PCT/SE1987/000426
Other languages
English (en)
Inventor
Conny Togeretz
Original Assignee
Conny Togeretz
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 Conny Togeretz filed Critical Conny Togeretz
Publication of WO1988002588A1 publication Critical patent/WO1988002588A1/fr
Priority to NO882231A priority Critical patent/NO168919C/no
Priority to DK283688A priority patent/DK283688D0/da

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

Definitions

  • This invention relates to a method of preventing unauthorized copying of video tape cassette recordings and an apparatus for executing the method.
  • the method is based on a procedure by which, when producing video cassettes intended to be held for sale or lease by copying (dubbing) an original video tape recording, strong signal components are introduced into the video signal to be recorded, which signal components modify the recorded signal in such a manner that, should the video tape thus produced be unduly copied, a satisfactory video picture of such "pirate” video tape would not be reproduceable, while, however, the authorized "original copies” produced by means of the method according to the invention are reproduceable in conventional video tape recorders (VTR:s) without the modifying signal recorded thereon adversely influending the reproduction quality of the video picture.
  • VTR video tape recorders
  • the modification signal applied to it will have an influence on the recording signal of the copying VTR that such copies of the "original” copy, when played back, will give rise to inacceptable pictures: The picture rolls, loses colors and synchronization.
  • the modification signal acts as an interference signal which effectively destructs the entire picture content of the video tape.
  • This invention relates to a method of this kind which is particular ⁇ ly suited to be used for producing, by simultaneous copying, a plurality of video tape cassettes intended to be held for sale or let out on hire and each containing a copy of a video signal recording on an original video tape, a 1"- tape for instance, comprising vertical and horizontal synchronizing signal, color signal, and picture signal portions, and in which the recorded signal has been modified in accordance with the invention to make difficult or prevent production of useable copies by copying the cassettes thus produced.
  • Figure 1 shows a block diagram of an apparatus for simultaneous production of a plurality of copies of an original video tape, said copies being modified according to the invention
  • FIG. 3 illustrates an implementation of the method according to the invention
  • -said means comprise a pulse train generator unit 4 for generating signals in the form of a pulse train required for modifying the video signal and comprising means for setting duration, position in time, and amplitude of the pulses of said pulse train, a detector unit 5 for detecting the time of appearance of the interval (vs + ihs) of the video signal intended for implementation of the modification signal, and a pulse implementation unit 6 for superpositioning the modification signal pulses on the video signal within said interval (vs + ihs) thereof.
  • the video signal On its way from the master 1 to the booster amplifier 2, the video signal passes the detector unit 5.
  • the detector unit 5 delivers a trigger signal to pulse train generator 4, causing this unit in dependence of choice of pulse position and pulse train duration within the synchronization interval (vs + ihs) for each picture to deliver a pulse burst to pulse implementation unit 6, in which unit said pulse burst is superimposed on the video signal within the time interval determined by means of said pulse duration setting means of the pulse train generating unit 4, e.g., as shown in Fig. 2, a pulse train with the duration p_.
  • a video cassette tape having a recorded signal generally corresponding to the ones shown in Figs. 2 and 3 was copied in a video recording machine delivering a highest peak-to-peak-voltage of 1 volt in accordance with known standard.
  • the values of the characters pulse amplitude, pulse duration, pulse position, and pulse frequency were varied from part to part of copies thus produced. Subsequently, such copies were copied in a conventional video machine equipped with tape copying facilities, whereafter the signal obtained from such "pirate copies" was measured in the same manner as the signal obtained from the original.
  • circuits which constitute components of the pulse train generator unit 4 of an apparatus according to the invention and which determine the characters frequency, amplitude, duration, and position of the modification signals, whether said circuits are arranged for having an invariable or a variable influence on the signal may be arranged on the basis of well known technique and, of course, in the latter case the control of the variation, at random for instance, of one or more of said characters may. be provided for by means of computer.

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)
  • Management Or Editing Of Information On Record Carriers (AREA)

Abstract

Un procédé, servant à empêcher la duplication non autorisée du contenu de bandes de cassettes vidéo, est particulièrement destiné à être utilisé pour la production simultanée de plusieurs cassettes vidéo destinées à la vente comprenant chacune un réenregistrement du signal vidéo enregistré sur une bande vidéo originale et comportant des parties traditionnelles de synchronisation verticale (vs), de synchronisation horizontale (hs) et de signaux d'images (10). La bande vidéo originale est reproduite dans une unité vidéo de reproduction (1) et le signal vidéo produit par cette unité est appliqué à un certain nombre de magnétoscopes (3) pour l'enregistrement des bandes d'un nombre correspondant de cassettes vidéo après leur superposition avec un signal de modification, dont le but est d'empêcher la duplication des cassettes vidéo ainsi produites. Selon la présente invention, le signal vidéo produit par ladite unité vidéo de reproduction (1) se superpose pendant son transfert vers les magnétoscopes (3) avec un signal de modification (11, Fig. 3), dont l'amplitude est plusieurs fois supérieure à l'amplitude des signaux de synchronisations verticale et horizontale et de préférence supérieure aux amplitudes maximales des parties d'informations d'image (10) du signal vidéo. Ce signal de modification se compose de rafales de plusieurs impulsions individuelles dans les intervalles de signaux (vs + ihs) et de préférence d'une fréquence de répétition des impulsions se situant entre 20 et 50 kHz. La présente invention se rapporte en outre à un appareil de réalisation dudit procédé.
PCT/SE1987/000426 1986-09-24 1987-09-22 Procede servant a empecher la duplication non autorisee de cassettes video et appareil de realisation dudit procede WO1988002588A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
NO882231A NO168919C (no) 1986-09-24 1988-05-20 Fremgangsmaate til aa hindre uautorisert gjengivelse av innholdet paa videokassettbaand samt et apparat til aa gjennomfoere fremgangsmaaten.
DK283688A DK283688D0 (da) 1986-09-24 1988-05-24 Fremgangsmaade til at forhindre uberettiget kopiering af indholdet af videokassettebaand og apparat t il udoevelse af fremgangsmaaden

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8604024-3 1986-09-24
SE8604024A SE458081B (sv) 1986-09-24 1986-09-24 Foerfarande foer att hindra obehoerig kopiering av innehaallet paa videokassettband och anordning foer genomfoerande av foerfarandet

Publications (1)

Publication Number Publication Date
WO1988002588A1 true WO1988002588A1 (fr) 1988-04-07

Family

ID=20365686

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1987/000426 WO1988002588A1 (fr) 1986-09-24 1987-09-22 Procede servant a empecher la duplication non autorisee de cassettes video et appareil de realisation dudit procede

Country Status (6)

Country Link
EP (1) EP0324755A1 (fr)
JP (1) JPH02500709A (fr)
AU (1) AU7962787A (fr)
DK (1) DK283688D0 (fr)
SE (1) SE458081B (fr)
WO (1) WO1988002588A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5418853A (en) * 1992-07-24 1995-05-23 Sony Corporation Apparatus and method for preventing unauthorized copying of video signals
WO1996031878A1 (fr) * 1995-04-07 1996-10-10 Trevor Franklin Procede et appareil de traitement d'un signal video
GB2387497A (en) * 2002-02-01 2003-10-15 Dwight Cavendish Systems Ltd Anti-copy protection for a video signal
US8019201B2 (en) 2002-06-28 2011-09-13 Dcs Copy Protection Limited Method and apparatus for providing a copy-protected video signal
US8032006B2 (en) 2003-06-05 2011-10-04 Dcs Copy Protection Limited Digital processing disruption systems
US8160423B2 (en) 2004-10-13 2012-04-17 Dcs Copy Protection Limited Audio copy protection system
US8542980B2 (en) 2002-02-01 2013-09-24 Dcs Copy Protection Ltd. Anti-copy protection for a video signal

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4163253A (en) * 1976-03-23 1979-07-31 Sony Corporation Method of and apparatus for modifying a video signal to prevent unauthorized recording and reproduction thereof
GB2055501A (en) * 1979-08-03 1981-03-04 Ivs Uk Ltd Video tape recording apparatus

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4163253A (en) * 1976-03-23 1979-07-31 Sony Corporation Method of and apparatus for modifying a video signal to prevent unauthorized recording and reproduction thereof
GB2055501A (en) * 1979-08-03 1981-03-04 Ivs Uk Ltd Video tape recording apparatus

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5418853A (en) * 1992-07-24 1995-05-23 Sony Corporation Apparatus and method for preventing unauthorized copying of video signals
WO1996031878A1 (fr) * 1995-04-07 1996-10-10 Trevor Franklin Procede et appareil de traitement d'un signal video
AU709667B2 (en) * 1995-04-07 1999-09-02 Trevor Franklin Method and apparatus for treating a video signal
GB2387497A (en) * 2002-02-01 2003-10-15 Dwight Cavendish Systems Ltd 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
US9269392B2 (en) 2002-02-01 2016-02-23 Dcs Copy Protection Limited Anti-copy protection for a video signal
US8542980B2 (en) 2002-02-01 2013-09-24 Dcs Copy Protection Ltd. Anti-copy protection for a video signal
US9264657B2 (en) 2002-06-28 2016-02-16 Dcs Copy Protection Limited Method and apparatus for providing a copy-protected video signal
US8019201B2 (en) 2002-06-28 2011-09-13 Dcs Copy Protection Limited Method and apparatus for providing a copy-protected video signal
US8032006B2 (en) 2003-06-05 2011-10-04 Dcs Copy Protection Limited Digital processing disruption systems
US8837909B2 (en) 2003-06-05 2014-09-16 Dcs Copy Protection Ltd. Digital processing disruption systems
US8639092B2 (en) 2004-10-13 2014-01-28 Dcs Copy Protection Limited Audio copy protection system
US8160423B2 (en) 2004-10-13 2012-04-17 Dcs Copy Protection Limited Audio copy protection system

Also Published As

Publication number Publication date
JPH02500709A (ja) 1990-03-08
EP0324755A1 (fr) 1989-07-26
SE8604024D0 (sv) 1986-09-24
DK283688A (da) 1988-05-24
SE8604024L (sv) 1988-03-25
DK283688D0 (da) 1988-05-24
SE458081B (sv) 1989-02-20
AU7962787A (en) 1988-04-21

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