On Thursdays the USPTO publishes new pending patent applications. Both of today's Spotlight Applications concern aspects of conditional access systems typically used in cable, satellite, and IPTV systems and both are assigned to Irdeto (NL). The first application discloses techniques for disabling a cleartext control word loading mechanism in a conditional access system. The second application discloses broadcasting variants of digital signals in a conditional access system.
20110211694, "Disabling a cleartext control word loading mechanism in a conditional access system, " assigned to Irdeto Corporate B.V. (NL).
Various embodiments 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. Hereto 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.
20110211695, "Broadcasting variants of digital signals in a conditional access system," assigned to Irdeto B.V. (NL).
The invention provides a headend system, a receiver, a smartcard and a conditional access system enabling distribution of multiple variants of a part of a digital signal, such as multiple variants of an audio part or a video part of a data stream, without requiring receivers to be updated. The digital signal generated by the headend system enables a receiver to receive and process the digital signal without requiring identification of the copies in the second digital signal. Error handling capabilities of the receiver ensure that only one copy is used in the output of the receiver. The error handling capabilities are triggered by having the receiver use one decryption key for descrambling all copies, resulting in one copy being descrambled correctly and the other copies being descrambled incorrectly.