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digital watermark

   Also found in: Wikipedia 0.01 sec.

digital watermark

A pattern of bits embedded into a file 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 a DVD movie, then all copies of that disc are uniquely identified. If a licensee were to manufacture and distribute them in areas outside of its authorized territory, 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.

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.


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First, NTT Comware's Authentication System compares the data embedded within the digital watermark with the data contained within the website.
NTT Comware Launches PHISHCUT Digital Watermarking Anti-Phishing ... by JCNN News Summaries
The digital watermark data is not perceptible to the human eye or ear, but can be read by computers.
INTENT MediaWorks Leads Multi-Industry P2P Watermarking Initiative by Business Wire
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.
Digimarc and AquaMobile to Bring Spanish and Portuguese Camera Phone ... by Business Wire
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