发明名称 |
CRITICAL PACKET PARTIAL ENCRYPTION |
摘要 |
An encryption arrangement for multiple encryption of television programs. A system according to embodiments of the present invention multiple encrypts only a portion of the data required for full presentation of a television program to permit multiple manufacturer's set-top boxes (36 and 136) within a single system. In one embodiment, only critical packets such as those carrying a payload incorporating packetized elementary stream header information is encrypted. By only encrypting a portion of the program, dramatically less bandwidth is consumed that the alternative of multiple encryption of all program data, thus permitting a larger number of multiple conditional access systems in a single cable television system. |
申请公布号 |
EP1464174(B1) |
申请公布日期 |
2012.02.08 |
申请号 |
EP20020795874 |
申请日期 |
2002.12.13 |
申请人 |
SONY ELECTRONICS, INC. |
发明人 |
UNGER, ROBERT, ALLAN;CANDELORE, BRANT, L. |
分类号 |
H04N7/167;H04L9/16;H04N5/00;H04N7/16;H04N7/24 |
主分类号 |
H04N7/167 |
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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