Method of generating verification data

Details Method of generating verification data Method of generating verification data

G - Physics

11

B

G11B 20/00 (2006.01)

Patent

CA 2580906

To prevent dissemination of content stored on a DVD-RW disc, CPRM is provided. However, this does not provide a watertight system. The invention proposes to arrange a stream to be recorded such that the input for verification data and therefore verification data is different for different authorisation levels. Various embodiments for implementing the invention are disclosed and comprise re-arranging data packs to be recorded and /or modifying data in data packets.

Afin d'empêcher la dispersion de contenus stockés sur un disque DVD-RW, un CPRM est fourni. Néanmoins, ce système n'est pas pour autant étanche. Cette invention porte sur l'arrangement d'un flux à enregistrer de manière que l'entrée pour les données de vérification, et par conséquent les données de vérification, soient différentes pour des niveaux d'autorisation différents. Plusieurs modes de réalisation de l'invention consistent à réarranger des paquets de données à enregistrer et/ou à modifier les données dans les paquets de données.

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