发明名称 |
A CABLE TV CONVERTER FOR PREVENTING UNAUTHORIZED PROGRAMME VIEWING |
摘要 |
A method and apparatus prevent unauthorized programming viewing via a downloadable cable television converter. A booter checksum is computed from data contained in a downloaded booter image. A valid checksum is extracted from tag data associated with a scrambled program signal transmitted on the cable system. The booter checksum is compared to the extracted valid checksum. If the booter checksum and valid checksums match, a descrambler is enabled to descramble the scrambled program signal. If the checksums do not match, the descrambler is not enabled. In this manner, a pirate is prevented from downloading a false booter image to defeat the integrity of the converter. |
申请公布号 |
GB2191664(A) |
申请公布日期 |
1987.12.16 |
申请号 |
GB19870013562 |
申请日期 |
1987.06.10 |
申请人 |
* GENERAL INSTRUMENT CORPORATION |
发明人 |
WILLIAM * FREZZA;ROBERT * SIMONS;RICHARD * WESTERFER |
分类号 |
G06F21/10;H04N7/16;H04N7/167 |
主分类号 |
G06F21/10 |
代理机构 |
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代理人 |
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地址 |
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