Patent ID: 8914389

Claim:
An information processing device comprising: at least one processor executing stored program instructions; derivative content storage means configured to store and manage derivative content which is created by secondary editing using at least one content object as editing material, said derivative content including: a main unit portion comprising data for reproducing primary content that is referenced by the derivative content, wherein the primary content comprises audio and/or video, and directly referenced content information indicating directly referenced content, which comprises content directly referenced at a time of creating the derivative content; and importance setting means configured to set an indication of importance relating to the derivative content, based on a secondary usage state of the derivative content, the secondary usage state reflecting use of the directly referenced content by the derivative content and by at least one other derivative content different than the derivative content, the secondary usage state indicating that the at least one other derivative content is also dependent on the directly referenced content for playing back audio and/or video, and the secondary usage state determined based on said directly referenced content information, and based on a held content list reflecting a list of directly referenced content objects held locally by a user.