Copy protection system for optical discs
OwnerAnthony Miles, Iain Bensoninventors
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Abstract
An optical disc has a recording format including a first index indicating the positions of each of a plurality of program blocks within a program area, the program blocks comprising one or more content blocks containing readable data, and one or more unrecoverable blocks containing unrecoverable data, the recording format including a second index indicating the positions of the content blocks without indicating the positions of the unrecoverable blocks. Preferably, the second index indicates preferred start points for playing content on the optical disc.
Claims18
An optical disc having content data recorded thereon, in a format comprising:
- a. a plurality of program blocks within a program area on the disc, the program blocks comprising one or more content blocks comprising the content data, and one or more copy protection blocks containing unreadable data,
- b. a first index indicating the positions of each of the plurality of program blocks;
- and
- c. a second index indicating the positions of the content blocks without indicating the positions of the unreadable blocks.
The optical disc of 1, wherein the second index comprises preferred playback pointers.
An optical disc having content data recorded thereon, in a format comprising:
- a. a program area on the disc, comprising content data and a navigational index,
- b. outside the program area, one or more copy protection blocks containing unreadable data and one or more navigational pointers,
- wherein the navigational index is an indirect index via the one or more navigational pointers.
A method of manufacturing an optical disc, comprising formatting content data in a format comprising:
- a. a plurality of program blocks within a program area on the disc, the program blocks comprising one or more content blocks comprising the content data, and one or more copy protection blocks containing unreadable data,
- b. a first index indicating the positions of each of the plurality of program blocks;
- and
- c. a second index indicating the positions of the content blocks without indicating the positions of the unreadable blocks.
Dependencies are inferred from the claim text.