发明申请
US20050157877A1 System for denying access to content generated by a compromised off line encryption device and for conveying cryptographic keys from multiple conditional access systems
有权
用于拒绝访问由受损的离线加密设备生成的内容并用于从多个条件访问系统传送加密密钥的系统
- 专利标题： System for denying access to content generated by a compromised off line encryption device and for conveying cryptographic keys from multiple conditional access systems
- 专利标题（中）： 用于拒绝访问由受损的离线加密设备生成的内容并用于从多个条件访问系统传送加密密钥的系统
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申请号： US11077298申请日： 2005-03-09
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公开(公告)号： US20050157877A1公开(公告)日： 2005-07-21
- 发明人: Annie Chen , Lawrence Tang , Akiko Wakabayashi
- 申请人： Annie Chen , Lawrence Tang , Akiko Wakabayashi
- 申请人地址： US PA Horsham
- 专利权人： General Instrument Corporation
- 当前专利权人： General Instrument Corporation
- 当前专利权人地址： US PA Horsham
- 主分类号： H04N7/16
- IPC分类号： H04N7/16 ; H04N7/167 ; H04N7/173
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 receipient 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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