发明名称 |
System for denying access to content generated by a compromised off line encryption device and for conveying cryptographic keys from multiple conditional access systems |
摘要 |
A method for forwarding messages containing cryptographic keys from a conditional access system that controls a population of set-top boxes to an encryption renewal system. The method includes storing a fictitious address of a virtual set-top box; generating a message based on the fictitious address, the message containing a cryptographic key; and forwarding the message to the fictitious address of the virtual set-top box. The encryption renewal system has information regarding the virtual set-top box, and is the recipient of the message. In addition, the encryption renewal system is for controlling access to pre-encrypted content generated by an encryption device. The system includes software instructions for receiving a request to retrofit an entitlement control message that allows a home device to access pre-encrypted content; and software instructions for retrofitting the entitlement control message only after verifying that the pre-encrypted content was generated prior to or contemporaneous with an authorized timestamp.
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申请公布号 |
US7076661(B2) |
申请公布日期 |
2006.07.11 |
申请号 |
US20050077298 |
申请日期 |
2005.03.09 |
申请人 |
GENERAL INSTRUMENT CORPORATION |
发明人 |
CHEN ANNIE ON-YEE;TANG LAWRENCE W.;WAKABAYASHI AKIKO |
分类号 |
H04L9/00;H04N7/16;H04N7/167;H04N7/173 |
主分类号 |
H04L9/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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