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1. WO2000042763 - METHOD AND APPARATUS FOR SCRAMBLING A HIGH DEFINITION TELEVISION SIGNAL

Publication Number WO/2000/042763
Publication Date 20.07.2000
International Application No. PCT/US2000/000963
International Filing Date 14.01.2000
Chapter 2 Demand Filed 15.08.2000
IPC
H04N 5/765 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
5Details of television systems
76Television signal recording
765Interface circuits between an apparatus for recording and another apparatus
H04L 9/20 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
9Arrangements for secret or secure communication
18Encryption by serially and continuously modifying data stream elements, e.g. stream cipher systems
20Pseudorandom key sequence combined element-for-element with data sequence
H04N 5/91 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
5Details of television systems
76Television signal recording
91Television signal processing therefor
H04N 5/913 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
5Details of television systems
76Television signal recording
91Television signal processing therefor
913for scrambling
H04N 5/92 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
5Details of television systems
76Television signal recording
91Television signal processing therefor
92Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
H04N 7/015 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
7Television systems
015High-definition television systems
CPC
H04N 2005/91357
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
5Details of television systems
76Television signal recording
91Television signal processing therefor
913for scrambling ; ; for copy protection
91357by modifying the video signal
H04N 21/835
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
21Selective content distribution, e.g. interactive television or video on demand [VOD]
80Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
83Generation or processing of protective or descriptive data associated with content; Content structuring
835Generation of protective data, e.g. certificates
H04N 5/913
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
5Details of television systems
76Television signal recording
91Television signal processing therefor
913for scrambling ; ; for copy protection
H04N 7/015
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
7Television systems
015High-definition television systems
H04N 7/08
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
7Television systems
08Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band ; , e.g. by time division
H04N 7/088
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
7Television systems
08Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band ; , e.g. by time division
087with signal insertion during the vertical blanking interval ; only
088the inserted signal being digital
Applicants
  • MACROVISION CORPORATION [US/US]; 1341 Orleans Drive Sunnyvale, CA 94089, US
Inventors
  • RYAN, John, O.; US
  • HOLZGRAFE, James, R.; US
  • HOLLAR, Mark, A.; US
Agents
  • KLIVANS, Norman, R. ; Skjerven, Morrill, Macpherson, Franklin & Friel LLP 25 Metro Drive, Suite 700 San Jose, CA 95110, US
Priority Data
60/115,96815.01.1999US
60/117,32325.01.1999US
60/131,74130.04.1999US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) METHOD AND APPARATUS FOR SCRAMBLING A HIGH DEFINITION TELEVISION SIGNAL
(FR) PROCEDE ET APPAREIL D'EMBROUILLAGE D'UN SIGNAL DE TELEVISION HAUTE DEFINITION
Abstract
(EN)
Method and apparatus for scrambling a high definition television signal to discourage unauthorized recording of same. While recording per se is not prevented, the resulting recorded signal is rendered unusable due to an induced 'wobble' between the active video and the associated sync pulses. The scrambled television signal is readily viewable on a compliant high definition television set which descrambles the HDTV signal using an encoded indication of the amount of wobble accompanying the HDTV signal. Also provided is a special interface to prevent unauthorized persons from using the indication of the amount of wobble so as to defeat the scrambling. Also provided are method and apparatus for defeating the scrambling method and hence allowing recording of the scrambled video signal.
(FR)
L'invention concerne un procédé et un appareil permettant d'embrouiller un signal de télévision haute définition (HDTV) afin de décourager tout enregistrement sans autorisation. Bien que l'enregistrement $i(per se) ne soit pas impossible, le signal enregistré obtenu est rendu inutilisable en raison d'une 'vobulation' induite entre les impulsions vidéo actives et les impulsions de synchronisation associées. Le signal de télévision embrouillé peut être rapidement visualisé sur un terminal de télévision haute définition aux normes, lequel désembrouille le signal HDTV grâce à une indication codée du nombre de vobulations accompagnant le signal HDTV. L'invention concerne également une interface spéciale destinée à empêcher que des personnes non autorisées utilisent cette indication du nombre de vobulations pour mettre l'embrouillage en échec. L'invention concerne enfin un procédé et un appareil venant à bout dudit procédé d'embrouillage, et par conséquent, autorisant l'enregistrement du signal vidéo embrouillé.
Also published as
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