Method and apparatus for the protection of signal copy

Method and apparatus for usage protection of data files using sp

Method and apparatus of controlling processing devices during po

Method and apparatus to defeat certain copy protection pulses wi

Method and apparatus to protect computer software

Method and device for data decryption, a method and device for d

Method and device for enciphering data to be transferred and for

Method and device for preventing tape piracy

Method and device for protecting data of ROM

Method and device for protecting software delivered to a user by

Method and device for protecting stored data

Method and device for temporarily authorizing the use of a progr

Method and device for utilizing data content

Method and manufacture for preventing unauthorized use by judgin

Method and system for audio information dissemination using vari

Method and system for checking security of data received by a co

Method and system for controlling distribution of software in a

Method and system for creating and storing a backup copy of file

Method and system for detecting fraudulent data update

Method and system for digital information protection