Digital-watermark meaning

A series of bits encoded in a digital media file, used to identify either the file itself, its owners, or licensed users. The bits are incorporated in such a way that common editing operations, like cropping, will not render the watermark unreadable.
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A pattern of bits embedded into a file that is used to identify the source of illegal copies. For example, if a digital watermark is placed into a master copy of an audio CD or DVD movie, then all copies of that disc are uniquely identified. If a licensee were to manufacture and distribute them in areas outside of their authorized territories, the watermark provides a trace.The watermark developer has to find creative ways of altering the file without disturbing it for the user. It is difficult to embed a watermark within an ASCII file, which is just raw text. However, it is relatively easy to alter a few bits within audio, video and image formats without making a noticeable difference on playback or display.
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(computing) Auxiliary data embedded in a datafile for subsequent identification and verification of the file.
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