发明公开
EP2227015A2 Conditional entitlement processing for obtaining a control word
有权
Bedingungsberechtigungsverarbeitung zum Erhalten eines Kontrollwortes
- 专利标题： Conditional entitlement processing for obtaining a control word
- 专利标题（中）： Bedingungsberechtigungsverarbeitung zum Erhalten eines Kontrollwortes
-
申请号： EP10154151.4申请日： 2010-02-19
-
公开(公告)号： EP2227015A2公开(公告)日： 2010-09-08
- 发明人: Eisen, Philip Allan , Benedetti, Ettore , Van Foreest, Arnoud Evert , Wajs, Andrew Augustine
- 申请人： Irdeto Access B.V.
- 申请人地址： Jupiterstraat 42 2132 HD Hoofddorp NL
- 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： Jupiterstraat 42 2132 HD Hoofddorp NL
- 代理机构： van Looijengoed, Ferry Antoin Theodorus
- 优先权： EP09154129 20090302; EP09155007 20090312
- 主分类号： H04N7/167
- IPC分类号： H04N7/167
摘要：
The invention provides 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. The invention can be used in a conditional access system such as a Pay-TV system.
公开/授权文献
信息查询
