Digital Security: Just Add Watermark

Embedded digital tags could foil piracy of music and images

Most people wouldn't walk into a store and pay money for a compact disk that was being given away on the street outside. That holds true when the street is the Information Superhighway, too. The Recording Industry Association of America (RIAA) says illegal Web sites offering free music downloads could eventually cost the industry $2 billion a year. It recently won court orders against three illegal sites.

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