System and method for protection of digital works

System and method for protection of video signals

System and method for transferring electronic information

System and process for adaptive and progressive scrambling...

System for preventing playback of unauthorized digital video...

System, method, and device for playing back recorded audio,...

Techniques of imperceptibly altering the spectrum of a...

Transforming data files into logical storage units for...

Unique identifier per chip for digital audio/video data...

Video bit scrambling

Video information generating apparatus, video communication...

Video signal receiver with record protection

Video-signal output apparatus, video-signal input apparatus,...

Watermark embedding and detection

Watermarking of digital object