| 摘要 |
PROBLEM TO BE SOLVED: To enable a chipset of a receiver of a conditional access system to block cleartext control words provided to the chipset from being used to descramble content. SOLUTION: The chipset comprises a trigger module configured to obtain a disable command that is received with an encrypted Chip Set Session Key (CSSK) and, if the disable command is obtained, have the chipset block any cleartext control word. COPYRIGHT: (C)2011,JPO&INPIT |
