Computer software encryption apparatus
Computer software protection
Computer system security
Computer system security method and apparatus for creating and u
Computer system security method and apparatus having program aut
Computer system with secured data paths and method of protection
Computer with improved keyboard password functions
Computer-based trading card system and method
Concealment method and arrangement and reproducing apparatus pro
Conditional access
Confidential communication system
Content protection for transmission systems
Copy indicating security device
Copy prevention apparatus and method therefor
Copy prevention method and apparatus for digital video system
Copy prevention method and apparatus for digital video system
Copy prevention method and apparatus of a digital magnetic recor
Copy protection for recorded media
Copyright control system
Cordless phone system capable of scrambling communication signal