发明名称 |
Conditional access filter as for a packet video signal inverse transport system |
摘要 |
Apparatus in a receiver, for processing transmitted entitlement control information, includes a packet transport processor for selecting signal packets having payloads containing a conditional access payload header and a remaining payload of entitlement data. Respective payload headers include groups of bytes which are coded in a manner to allow or disallow the respective receiver from processing the entitlement data. A conditional access filter preprogrammed with a subscriber specific conditional access codeword examines respective byte groupings of the conditional access header for a match with the subscriber specific conditional access codeword. Only if a match occurs is the processor permitted to process the entitlement data. The entitlement data is thereafter utilized to generate decryption keys for descrambling portions of the transmitted signal.
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申请公布号 |
US6671881(B1) |
申请公布日期 |
2003.12.30 |
申请号 |
US19960759912 |
申请日期 |
1996.12.04 |
申请人 |
THOMSON LICENSING S.A. |
发明人 |
TAMER GREGORY GEORGE;DEISS MICHAEL SCOTT;CHANEY JOHN WILLIAM;HAILEY JAMES EDWIN |
分类号 |
H04N5/00;H04N5/44;H04N7/16;H04N7/167;(IPC1-7):H04N7/167 |
主分类号 |
H04N5/00 |
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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