Wikipedia 10K Redux by Reagle from Starling archive. Bugs abound!!!

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Watermark

A watermark is a design made by impressing a water coated metal stamp or roll on paper during manufacturing.  Watermarks originally were used on postage stamps, currency and other government documents to prevent counterfeiting.  

Encoding an idenfifying code into digitized music, video, picture, or other file is known as a [[Digigal Watermark]].