发明申请
- 专利标题： CONDITIONAL ENTITLEMENT PROCESSING FOR OBTAINING A CONTROL WORD
- 专利标题（中）： 用于获得控制词的条件执行处理
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申请号： US12715047申请日： 2010-03-01
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公开(公告)号： US20100251285A1公开(公告)日： 2010-09-30
- 发明人: Philip Allan Eisen , Ettore Benedetti , Arnoud Evert Van Foreest , Andrew Augustine Wajs
- 申请人： Philip Allan Eisen , Ettore Benedetti , Arnoud Evert Van Foreest , Andrew Augustine Wajs
- 申请人地址： NL Hoofddorp
- 专利权人： Irdeto Access B.V.
- 当前专利权人： Irdeto Access B.V.
- 当前专利权人地址： NL Hoofddorp
- 优先权： EP09154129.2 20090302; EP09155007.9 20090312; EP10154151.4 20100219
- 主分类号： H04N7/167
- IPC分类号： H04N7/167
摘要：
Embodiments of the invention provide an improved method and an improved receiver for obtaining a control word. Two or more subkeys are obtained in a receiver. Each subkey was encrypted under control of a key received in an entitlement message or transformed under control of a seed received in an entitlement message. After decryption or transformation, the subkeys are combined to obtain the control word. Typically at least one of the entitlement messages is a positive entitlement message and at least one of the entitlement messages is a negative entitlement message. Embodiments of the invention can be used in a conditional access system such as a Pay-TV system.
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