digital watermark


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digital watermark

[‚dij·əd·əl ′wȯd·ər‚märk]
(computer science)
Invisible or inaudible data (a random pattern of bits or noise) permanently embedded in a graphic, video, or audio file for protecting copyright or authenticating data.

digital watermark

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 extremely difficult to embed a watermark within an ASCII file, which is just raw text. But it is relatively easy to alter a few bits within audio, video and graphics formats without making a noticeable difference on playback or display.
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PHISHCUT embeds digital watermarks into websites used by financial institutions as well as internet banking and shopping sites.
The resulting white paper outlines how digital watermarks can be used in P2P networks to provide benefits to all constituents: consumers, P2P system operators, Internet service providers (ISPs), and content owners.
com/watermark/mobile/ uses Digimarc's patented digital watermarking technology to give camera phone users simple navigation from printed materials carrying an "invisible" digital watermark to compelling mobile media entertainment and commerce.
Digital watermarks can identify copyrighted content and associated rights, during and after distribution, to determine copyright ownership and facilitate rights management policy while enabling innovative new content distribution and usage models.