| 摘要 |
A method for digital rights management for a copyright work that is copied from device to device from among a plurality of devices, some of which are parent devices and some of which are child devices, and wherein a child device may be registered with a parent device, including copying a digital work from a parent device, P 1 , to a child device, C 1 , registered with device P 1 , the digital work encapsulating digital rights management (DRM) data that serves to permit full access to the digital work by parent device P 1 , and to deny access to the digital work by devices other than device P 1 , modifying the DRM data in the copy of the digital work within device C 1 , so as to permit full access to the digital work, for a prescribed time period, by device C 1 and by child devices other than device C 1 , inserting auxiliary DRM data in the copy of the digital work within device C 1 , so as to permit full access to the digital work by device C 1 , and so as to permit limited access to the digital work by child devices other than device C 1 , if the digital work is copied from device C 1 to a parent device P 2 other than device P 1 , then modifying the DRM data in the copy of the digital work within device P 2 , so as to permit limited access to the digital work by device P 2 , and removing the auxiliary DRM data in the copy of the digital work within device P 2 , and if the digital work is copied from device C 1 to a child device C 2 other than device C 1 , then modifying the auxiliary DRM data in the copy of the digital work within device C 2 , so as to permit limited access to the digital work by child device C 2 and so as to permit limited access to the digital work by child devices other than device C 2 . A system and a computer-readable storage medium are also described and claimed.
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