Method and apparatus for fingerprinting magnetic media

Method and apparatus for frequency control of multiple oscillato

Method and apparatus for improved fingerprinting and authenticat

Method and apparatus for impulse purchasing of packaged informat

Method and apparatus for irrigation control using evapotranspira

Method and apparatus for jamming infrared remote controls

Method and apparatus for jamming selected television programs

Method and apparatus for manufacturing pre-recorded videotape pr

Method and apparatus for modifying a video signal

Method and apparatus for preventing external detection of signal

Method and apparatus for preventing extraneous detection of sign

Method and apparatus for preventing extraneous detection of sign

Method and apparatus for preventing recognition of a telephone d

Method and apparatus for process control, tension control, and t

Method and apparatus for protecting computer software utilizing

Method and apparatus for protecting multiple copies of computer

Method and apparatus for protecting software

Method and apparatus for protecting widely distributed digital i

Method and apparatus for protection of signal copy

Method and apparatus for protection of software in an electronic