Invention Grant
US08689351B1 Playing control files for personal video recorders 失效
播放个人录像机的控制文件

Playing control files for personal video recorders
Abstract:
The certificate with specified conditions under which copyrighted material can be played. Copyrighted material, such as videos are stored in a storage unit. They are stored along with a policy that indicates when the information can be played. The information can, for example be encrypted one stored, and the decryption key is available only when characteristics of the policy are met. When those characteristics are not met, the information can not be retrieved at all or only can be retrieved in some very limited format.
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