IMPROVEMENTS IN OR RELATING TO THE COPY PROTECTION OF OPTICAL DISCS

摘要

In a method of copy protecting an optical disc carrying information and control data, access to selected information is controlled by removing, corrupting, or otherwise rendering incorrect or inaccurate control data describing the selected information. For example, where an optical disc carries both a first, audio, session (30) and a second, data, session (40), the audio session (30) can be effectively hidden from a data reader by including control data in the data session which incorrectly identifies audio files as data files. In addition, or as an alternative, information in the files, directories, or descriptors of the volume of information making up a data session may be removed, corrupted or rendered incorrect to similarly prevent a data reader accessing the information.