发明名称 |
SECURITY ARRANGEMENT FOR DOWNLOADABLE CABLE TELEVISION CONVERTERS |
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 |
CA1268247(A) |
申请公布日期 |
1990.04.24 |
申请号 |
CA19870539619 |
申请日期 |
1987.06.15 |
申请人 |
GENERAL INSTRUMENT CORPORATION |
发明人 |
FREZZA, WILLIAM;SIMONS, ROBERT;WESTERFER, RICHARD |
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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主权项 |
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地址 |
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