| 摘要 |
<p>A Digital Rights Management (DRM) system is provided to manage license rights for video object files where both parent and child object files are created. In the system a license library is provided, the license library including data identifying a parent object file allowing access to first video content and child object files relating to the parent object file also allowing access to the first video content. Further, the system creates a data tree structure with a parent pointer identifying the child object files related to the parent, and child pointers identifying the parent pointer related to the child. The data tree structure is used to modify the license library when a first request is received to modify one of the parent object files or the child object files. When a copy count is used and decremented when additional copies are made, the system updates the pointers in the data tree structure accordingly.</p> |
