发明名称 |
Apparatus and method for access control |
摘要 |
In a system for controlling access to signals such as pay-TV signals, the signals include data packets that are received and by a decoder and forwarded to a smart card for access authorization processing. The data packets contain information that updates entitlement or access authorization data inside the smart card. Time-related data is added to the data packets. The smart card checks to determine if the time-related data evolves between two successive packets. If not, the smart card inhibits the delivering of descrambling parameters to the decoder.
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申请公布号 |
US5461675(A) |
申请公布日期 |
1995.10.24 |
申请号 |
US19930121599 |
申请日期 |
1993.09.14 |
申请人 |
THOMSON CONSUMER ELECTRONICS S.A. |
发明人 |
DIEHL, ERIC;NACCACHE, DAVID |
分类号 |
H04L9/10;G07F7/10;H04N5/00;H04N7/167;(IPC1-7):H04L9/32;H04L7/167 |
主分类号 |
H04L9/10 |
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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