Block cipher mode of operation for secure, length-preserving enc
Broadcast data access controller communication system
Broadcast encryption
Broadcast system for scrambled programming signals
Broadcasting system
Broadcasting system, and charging system and method
Cable system having multiple barkering
Cable television setback decoder automatic control
Cable television system
Cable television system having dynamic market code shuffling
Cable TV system using passwords
Cable TV system using passwords
Canal+ decoder switching circuit for video cassette recorders
Capability security for transparent distributed object systems
Card charging systems
Card-computer moderated systems
CATV subscriber apparatus with intelligent remote control
CATV system and method of curtailing reception of unauthorized s
CATV terminal unit
Cellular phone provided with legal identification means of the o