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1. WO2000038426 - METHOD AND SYSTEM FOR PROTECTING DIGITAL DATA FROM UNAUTHORIZED COPYING

Publication Number WO/2000/038426
Publication Date 29.06.2000
International Application No. PCT/US1999/011138
International Filing Date 20.05.1999
IPC
G06T 1/00 2006.01
GPHYSICS
06COMPUTING; CALCULATING OR COUNTING
TIMAGE DATA PROCESSING OR GENERATION, IN GENERAL
1General purpose image data processing
G09C 5/00 2006.01
GPHYSICS
09EDUCATING; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
CCIPHERING OR DECIPHERING APPARATUS FOR CRYPTOGRAPHIC OR OTHER PURPOSES INVOLVING THE NEED FOR SECRECY
5Ciphering or deciphering apparatus or methods not provided for in other groups of this subclass, e.g. involving the concealment or deformation of graphic data such as designs, written or printed messages
G11B 20/10 2006.01
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
20Signal processing not specific to the method of recording or reproducing; Circuits therefor
10Digital recording or reproducing
H04L 9/08 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
9Arrangements for secret or secure communication
08Key distribution
H04N 1/387 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
1Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
387Composing, repositioning or otherwise modifying originals
H04N 1/44 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
1Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
44Secrecy systems
CPC
G06T 1/0021
GPHYSICS
06COMPUTING; CALCULATING; COUNTING
TIMAGE DATA PROCESSING OR GENERATION, IN GENERAL
1General purpose image data processing
0021Image watermarking
H04N 1/4413
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
1Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
44Secrecy systems
4406Restricting access, e.g. according to user identity
4413involving the use of passwords, ID codes or the like, e.g. PIN
H04N 1/4486
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
1Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
44Secrecy systems
448Rendering the image unintelligible, e.g. scrambling
4486using digital data encryption
H04N 2005/91335
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
91307by adding a copy protection signal to the video signal
91335the copy protection signal being a watermark
H04N 2005/9135
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
91307by adding a copy protection signal to the video signal
9135by superimposing the spectrally spread copy protection signal onto the video signal
H04N 2005/91364
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
91364the video signal being scrambled
Applicants
  • SIGNAFY, INC. [US]/[US]
Inventors
  • COX, Ingemar, J.
  • MILLER, Matthew, L.
Agents
  • GROLZ, Edward, W.
Priority Data
09/215,96018.12.1998US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) METHOD AND SYSTEM FOR PROTECTING DIGITAL DATA FROM UNAUTHORIZED COPYING
(FR) PROCEDE ET SYSTEME DE PROTECTION DE DONNEES NUMERIQUES D'UN COPIAGE NON AUTORISE
Abstract
(EN)
Data is protected from unauthorized copying by rescrambling an unauthorized version of the data, but descrambling an authorized version of the data. This is done using a trigger signal. The trigger signal is embbeded into the data to form watermarked data. The possibly protected data or watermarked data is converted to possibly usable data by extracting the trigger signal and checking the value as show in the figure. The possibly protected data is passed through a descrambler (30), where the trigger signal, if present, is extracted. A descrambling key and a descrambling algorithm (40) are applied to the possibly protected data if the trigger signal is present, but not applied to the possibly protected data if the trigger signal is not present. One property of the trigger signal is that it is preserved through signal transformation, such as one or more compression, decompression, analog to digital conversion, and digital to analog conversion. As a result of this property the trigger signal can be detected in either scrambled or descrambled data.
(FR)
Selon l'invention, on empêche un copiage non autorisé par un nouveau cryptage d'une version non autorisée des données, ou par un décryptage d'une version autorisée des données, ce que l'on effectue au moyen d'un signal de déclenchement, lequel est encastré dans les données, afin de former des données filigranées. Les données éventuellement protégées ou filigranées sont converties en données éventuellement utilisables, par extraction du signal de déclenchement et vérification de la valeur (cf. la figure). Les données éventuellement protégées sont passées à travers un dispositif de décryptage (30) dans lequel le signal de déclenchement, s'il est présent, est extrait. Une clé et un algorithme de décryptage (40) sont alors appliqués aux données éventuellement protégées si le signal de déclenchement est présent, mais ne sont pas appliqués à ces données si le signal de déclenchement n'est pas présent. Une propriété de ce signal est qu'il est conservé, même lors de transformation de signaux exécutée par compression, décompression, conversion analogique/numérique, et conversion numérique/analogique. Grâce à cette propriété, le signal de déclenchement peut être détecté, soit dans des données cryptées, soit dans des données décryptées.
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