公开(公告)号：US20100183148A1

公开(公告)日：2010-07-22

申请号：US12356067

申请日：2009-01-19

申请人： Thomas Alexander Bellwood ,  Robert Glen Deen ,  Hongxia Jin ,  Jeffrey Bruce Lotspiech ,  Sigfredo Ismael Nin ,  Matthew Francis Rutkowski

发明人： Thomas Alexander Bellwood ,  Robert Glen Deen ,  Hongxia Jin ,  Jeffrey Bruce Lotspiech ,  Sigfredo Ismael Nin ,  Matthew Francis Rutkowski

IPC分类号： H04L9/06

CPC分类号： H04L9/0822 ,  H04L9/16 ,  H04L63/06 ,  H04L2209/60 ,  H04L2209/606 ,  H04L2463/062 ,  H04N7/1675 ,  H04N21/2541 ,  H04N21/4334 ,  H04N21/4408 ,  H04N21/4627 ,  H04N21/63345

摘要： According to one embodiment of the present invention, a method for protecting content in a broadcast-encryption-based system, where the devices in the system receive a recording key table. Each device generates a set of recording keys from the recording key table using a media key variant calculated from the broadcast encryption system's media key block. The digital content is encrypted in a title key picked by the recorder. The selected title key is also encrypted in each one of the recorder's generated recording keys. To play back the content, a player uses one of its generated recording keys to decrypt the title key and the decrypt the content. The recording key table is designed so that any two devices are guaranteed to have at least one key in common during normal operation, although during a forensic situation, this rule can be abandoned.

摘要翻译： 根据本发明的一个实施例，一种用于保护基于广播加密的系统中的内容的方法，其中系统中的设备接收记录密钥表。 每个设备使用从广播加密系统的媒体密钥块计算的媒体密钥变体从记录密钥表生成一组记录密钥。 数字内容以记录器拾取的标题密钥加密。 所选择的标题密钥也在记录器生成的记录密钥中的每一个中被加密。 要播放内容，播放器使用其生成的记录密钥之一来解密标题密钥并对内容进行解密。 记录键表被设计成使得任何两个装置在正常操作期间被保证具有至少一个共同的钥匙，尽管在取证情况下，该规则可以被放弃。