This disclosure describes several video watermarking and fingerprinting enhancements. These enhancements include synchronizing watermark detectors with one-dimensional calibration signals, layering digital watermarks, watermarks for version control, compressed domain watermarking, watermarking of video object layers, key channel watermark embedding for video, robust fingerprinting of video and watermarking of scalable video.

 
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< Recording information with a watermark related to a prerecorded medium mark on an information carrier

< System and method for authorized compression of digitized music

> Chain of custody system and method

> Method and system for electronic authentification

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