UNAUTHORIZED CONTENT DETECTION SYSTEM

摘要

PROBLEM TO BE SOLVED: To allow an executing device for conducting playback to have to be equipped with a highly efficient processor since the executing device performs verification of the contents validity in parallel with the contents playback and processing load on the executing device is high during the playback of contents.

SOLUTION: The present invention reduces the processing load involved in the verification by using, for the verification, only a predetermined number of encrypted units selected randomly from multiple encrypted units constituting encrypted contents recorded on the DVD. In addition, the present invention is capable of improving the accuracy of detecting unauthorized contents to some extent by randomly selecting a predetermined number of encrypted units every time the verification is performed.

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