System for preventing fraudulent use of credit card

System for preventing global positioning satellite signal recept

System for preventing piracy of recorded media

System for preventing playback of unauthorized digital video...

System for preventing remote detection of computer data from tem

System for preventing software piracy employing multi-encrypted

System for printing encrypted messages with a character generato

System for printing encrypted messages with bar-code representat

System for processing a scrambled video signal

System for processing a video signal via series-connected high s

System for processing an information signal

System for processing coded information

System for processing user access control data at a decoder

System for producing a printable security device image and...

System for producing synchronized signals

System for producing verifiable kiosk receipts and records

System for protecting digital equipment against remote access

System for protecting documents or objects enclosed in a tamper-

System for protection of goods against counterfeiting

System for protection of software in memory against unauthorized