A data system includes a secured appliance capable of receiving broadcast programming and a remote control used to transmit data frames to the secured appliance. The secured appliance is provided with a decryption key that is complimentary to an encryption key provided to the remote control. The encryption...http://www.google.com/patents/US6882729?utm_source=gb-gplus-sharePatent US6882729 - System and method for limiting access to data
