On Thursdays the USPTO publishes new pending patent applications. Both of today's Spotlight Applications concern aspects of conditional access systems. Assigned to Sony (JP, the first application discloses techniques for using authentication certificates in conditional accesss systems. Assignedt to NTT DOCOMO (JP), the second application discloses techniques related to a broadcast receiving terminal includes a conditional access system (CAS) module that acquires key information from a broadcast signal and a renderer that plays back video/audio data in the broadcast signal.
20120254618, "Authentication certificates," assigned to Sony (JP).
An audio/video content delivery system having a network content source linked by an internet data connection to a content receiver that receives content from the network content source via the internet data connection, and also receives access-controlled encoded broadcast content from the network content source or another content source via a separate broadcast data path. The network content source requests a client certificate from the content receiver. The content receiver includes a host module to store a network client certificate and send it to the network content source, and a conditional access module (CAM) with an access control unit for decoding the access-controlled encoded broadcast content. The host module and the CAM provide an encrypted communication link for decoded access-controlled encoded broadcast content. The broadcast content source transmits a client certificate to the CAM. The CAM transmits the client certificate to the host module via the encrypted communication link.
20120250861, "Broadcast reception terminal and broadcast reception method," assigned to NTT DOCOMO, Inc. (JP).
A broadcast receiving terminal includes a conditional access system (CAS) module that acquires key information from a broadcast signal and a renderer that plays back video/audio data in the broadcast signal. The CAS module includes a history information storage unit that stores playback history information and a playback time calculation unit that calculates playback remaining time information related to the video/audio data and sends a scrambling key and the playback remaining time information to the renderer. The renderer includes a descrambling unit and a decoding unit that decrypts the video/audio with the scrambling key to play them back and send history information related to the playback to the CAS module and a preview control unit that performs control to decrypt the video/audio data only for the time indicated by the playback remaining time information. The terminal achieves playback control in accordance with an actual playback time.