WatermarkAway from the computer context, a watermark is a design embossed into a piece of paper during its production and used to identify of the paper and/or papermaker. The watermark is normally invisible, but can be seen when the paper is held up to light. Some countries' bank notes, for example, use watermarks as a means of preventing forgery.
A digital watermark is a pattern incorporated into image (particularly bitmaps), video or audio data, that be used to carry identification information, particularly information about the copyright owner of the material. Some digital watermarks are highly visible even without special tools, whereas others may only be able to be resolved using special tools.
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