发明名称 |
Decoding and decryption of partially encrypted information |
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 coexistence of multiple conditional access encryption systems associated with multiple manufacturer's set-top boxes within a single system. By only encrypting a portion of the program, dramatically less bandwidth is consumed than the alternative of multiple encryption of all program data, thus permitting a larger number of programs to be carried over the same bandwidth while permitting coexistence of multiple conditional access systems in a single cable television system.
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申请公布号 |
US2002196939(A1) |
申请公布日期 |
2002.12.26 |
申请号 |
US20020037498 |
申请日期 |
2002.01.02 |
申请人 |
UNGER ROBERT ALLAN;CANDELORE BRANT L. |
发明人 |
UNGER ROBERT ALLAN;CANDELORE BRANT L. |
分类号 |
H04N7/16;H04N7/167;(IPC1-7):H04N7/167 |
主分类号 |
H04N7/16 |
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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