watermarking

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(v.) 1. With reference to images, the act of adding an identifying code that may be used to grant access to a user, or to maintain intellectual property rights. 2. In digital audio or video, this is embedded code within the digitized audio or video image that can be recovered but which will not affect the quality of the product. Most methods consist of very short segments a few microseconds long containing all the relevant data about the copyright owner and performance royalties.