Access controlled optical disc and method therefor

G - Physics – 11 – B

Patent

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Details

G11B 20/00 (2006.01) G11B 19/04 (2006.01) G11B 19/12 (2006.01)

Patent

CA 2492336

An optical disc is disclosed having a set of primary tracks and a set of alternate tracks. At least some of the primary and alternate tracks are associated. When a CD-DA reader accesses the optical disc, it locates only the primary tracks. By contrast, when a data reader such as a CD-Rom drive accesses the disc, modifications to the Table of Contents (TOC) cause the data reader not to access a given primary track but instead to be directed to its associated alternate track. This alternate track may contain audio (CD-DA) data which may or may not correspond with the CD-DA data in the associated primary track. The alternate tracks may be copy protected, and/or may include compressed (not CD-DA) data which is the subject of digital rights management.

Cette invention a trait à un disque optique, comportant un ensemble de pistes principales et un ensemble de pistes alternées. Certaines, au moins, de ces pistes, principales et alternées, sont associées. Lorsqu'un lecteur CD-DA a accès à ce disque optique, il ne localise que les pistes principales. Par contre, lorsqu'un lecteur de données, de CD-ROM notamment, a accès à ce disque, des modifications apportées à la table de contenus (TOC) font que ce lecteur ne peut pas accéder à une piste principale donnée, mais qu'il peut, en revanche, accéder à sa piste alternée associée. Cette dernière peut contenir des données audio (CD-DA), correspondant ou non aux données CD-DA de la piste principale associée. Ces pistes alternées peuvent être protégées contre la copie et/ou contenir des données comprimées (non CD-DA) devant être soumises à une gestion de droits numériques.

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