发明名称 |
Preventing fraudulent access in a conditional access system |
摘要 |
A receiver/decoder is programmed only to accept a current entitlement control message (EMM) if it has received at least a previous EMM of a previous calendar period. When this is received, it is used to check present rights in the receiver/decoder. The invention prevents an original subscriber from fraudulently obtaining rights by disconnecting a decoder (before an authorising message can update the decoder's memory to prevent decryption) and by reconnecting the decoder (so as to be mistaken for a new subscriber legitimately having those rights). <IMAGE> |
申请公布号 |
EP0866613(A1) |
申请公布日期 |
1998.09.23 |
申请号 |
EP19970402959 |
申请日期 |
1997.12.05 |
申请人 |
CANAL+ SOCIETE ANONYME |
发明人 |
MAILLARD, MICHEL |
分类号 |
G06F9/445;G06F9/06;G06F9/46;G06F9/48;G06F11/00;G06F11/08;G06F11/10;G06F11/14;G06F11/26;G06F11/28;G06F12/00;G06F12/02;G06F13/00;G06F13/10;G06F21/24;G06K17/00;G06K19/00;G06K19/07;G06Q20/00;G06T9/00;G07F7/00;G07F7/02;G07F7/08;G07F7/10;G09C1/00;G11C8/06;G11C16/02;H04B1/713;H04H20/02;H04H40/00;H04L1/00;H04L9/10;H04L9/32;H04L12/56;H04L13/08;H04L29/10;H04N;H04N5/00;H04N5/222;H04N5/44;H04N5/455;H04N7/14;H04N7/16;H04N7/167;H04N7/173;H04N7/26;H04N7/66;H04N17/00;H04N17/04;H04N21/4367;H04N21/442;H04N21/462;H04N21/4623;H04N21/4627;H04N21/6334;H04N21/8355 |
主分类号 |
G06F9/445 |
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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