Watermark

A digital watermark is a kind of marker covertly embedded in a noise-tolerant signal such as audio, video or image data. It is typically used to identify ownership of the copyright of such a signal. Digital watermarking is the process of hiding digital information in a carrier signal; the hidden information should, but does not need to, contain a relation to the carrier signal.

Digital watermarks may be used to verify the authenticity or integrity of the carrier signal or to show the identity of its owners.
It is prominently used for tracing copyright infringements and for banknote authentication.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 4.0

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