Complex document security
Comprehensive software protection system
Computer data security device and method
Computer file protection system
Computer file protection system
Computer for the control station of a machine, more particularly
Computer security system
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