Copy-protected optical disc and method for protecting same

Details Copy-protected optical disc and method for protecting same Copy-protected optical disc and method for protecting same

G - Physics

11

B

G11B 7/007 (2006.01) G11B 23/28 (2006.01) G11B 20/00 (2006.01)

Patent

CA 2398701

The invention concerns a copy-protected disc and a method for protecting such a disc. The disc comprises a main spiral track (1) and a secondary track (2) interposed partly between the turns of the main track. The sectors of the secondary track and those opposite the main track bear the same addresses (A to A+Q) and comprise a characteristic identifier of the track where they are located. The inventive method consists in identifying said structure by a series of readings of the sectors of the protective zone (A to A+Q) starting from the addresses respectively before and after said zone. The invention is applicable to discs such as CD-ROM or DVD-ROM protected against piracy.

L'invention concerne un disque optique protégé contre la copie et un procédé de protection pour un tel disque. Le disque comporte une piste principale en spirale (1) et une piste secondaire (2) intercalée partiellement entre les tours de la piste principale. Les secteurs de la piste secondaire et ceux en regard sur la piste principale portent les mêmes adresses (A à A+Q) et comprennent un identifiant caractéristique de la piste où ils se trouvent. Le procédé selon l'invention consiste à identifier cette structure par une série de lectures des secteurs de la zone de protection (A à A+Q) en partant d'adresses respectivement avant et après ladite zone. L'invention s'applique notamment aux disques de type CD-ROM ou DVD-ROM protégés contre le piratage.

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