发明名称 |
Scrambling and unscrambling method for composite video signals and implementing device |
摘要 |
The method of the invention consists, during the transmission of composite video signals, in the inclusion therein of series of access messages (ECM1, ECM2) and, during the unscrambling, carried out using a chip card reader whose chip card comprises encoded digital data, in using an interactive method of identification of a digital signature.
|
申请公布号 |
US5208856(A) |
申请公布日期 |
1993.05.04 |
申请号 |
US19910811906 |
申请日期 |
1991.12.23 |
申请人 |
LABORATOIRE EUROPEEN DE RECHERCHES ELECTRONIQUES AVANCEES |
发明人 |
LEDUC, MICHEL;HAMON, JOEL;GUILLON, JEAN-CLAUDE;RENARD, FRANCIS;DIEHL, ERIC |
分类号 |
H04N7/167 |
主分类号 |
H04N7/167 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|