Content identifiers for multilayered optical storage disks

摘要

The present invention is directed towards a method and device for providing data in a layered storage medium, such a storage medium, a signal ( 19 ) for provision of layer data in a storage medium as well as to a method and device for indicating correctness of content data on such a layered storage medium. Each layer of the storage medium comprises at least parts of a set of content data and identifying data ( 26, 28 ), which identifying data comprises a content identifier ( 26 ) that is common for and indicative of the whole set of content data, such that each layer having data belonging to the same set of content data has the same content identifier. In this way wrong combinations of sets of content data can easily be detected.