Improvements in and relating to optically readable discs and...

Details Improvements in and relating to optically readable discs and... Improvements in and relating to optically readable discs and...

G - Physics

11

B

G11B 7/013 (2006.01) G11B 20/00 (2006.01) G11B 20/12 (2006.01) G11B 27/28 (2006.01) G11B 27/30 (2006.01) G11B 7/004 (2006.01) G11B 7/007 (2006.01)

Patent

CA 2232818

An optical disc and an optical disc recording apparatus have been disclosed which provide an improved protection against undesired or illegal copying. Information on optical discs is arranged in sectors, which each has an address label. The address value of the address labels increases linearly from the start of the disc or from the start of the program area of the disc. The address labels of specific sectors, which may have an informationless content, are given different, e.g. zero, address values, which prevent copying CD-ROM discs on a standard CD-Recorder apparatus. Said address labels may be stored in the main data stream or e.g. the subcode channel of a CD system.

L'invention concerne un disque optique et un appareil d'enregistrement de disques optiques, comprenant une protection améliorée contre toute copie illégale ou indésirable. Les informations sur les disques optiques sont réparties en secteurs ayant chacun une étiquette d'adresse. La valeur d'adresse desdites étiquettes augmente de manière linéaire depuis le début du disque ou de la zone de programme du disque. Les étiquettes d'adresse de secteurs spécifiques, qui peuvent ne contenir aucune information, se voient attribuer différentes valeurs d'adresse telles que zéro, qui empêchent la copie de disques CD-ROM sur un appareil d'enregistrement de CD. Lesdites étiquettes d'adresse peuvent être mémorisées dans le flux de données principal ou, par exemple dans le canal à sous-code d'un système CD.

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