Patent attributes
A processing device, processing method, and information recording medium manages copyright and utilization control of each of fragmented data of contents stored on the recording medium. The information recording medium has contents of a utilization management object recorded thereon. Main contents having a data format which complies with a particular audio visual format, and sub-contents having another data format which does not comply with the audio visual format, are stored as recording data on the information recording medium. Configuration data of the main contents and the sub-contents are set as contents management units, and the data included in the contents management units are stored as encrypted data, encrypted with individual unit keys individually corresponding to the contents management units.
