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2. Watermark - Wikipedia

   en.wikipedia.org/wiki/Watermark

   Watermark. A watermark is an identifying image or pattern in paper that appears as various shades of lightness/darkness when viewed by transmitted light (or when viewed by reflected light, atop a dark background), caused by thickness or density variations in the paper. [ 1] Watermarks have been used on postage stamps, currency, and other ...

3. Digital watermarking - Wikipedia

   en.wikipedia.org/wiki/Digital_watermarking

   Digital watermarking is the process of hiding digital information in a carrier signal; the hidden information should, [ 2] 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.

4. Digital on-screen graphic - Wikipedia

   en.wikipedia.org/wiki/Digital_on-screen_graphic

   Digital on-screen graphic. A digital on-screen graphic, digitally originated graphic ( DOG, bug, [ 1] network bug, or screenbug) is a watermark-like station logo that most television broadcasters overlay over a portion of the screen area of their programs to identify the channel. They are thus a form of permanent visual station identification ...

5. Safe water mark - Wikipedia

   en.wikipedia.org/wiki/Safe_water_mark

   Safe water mark. A safe water mark, as defined by the International Association of Lighthouse Authorities, is a sea mark used in maritime pilotage to indicate the end of a channel. They usually imply that open, deep and safe water lies ahead. They are also used to indicate the start and end of a buoyed section of a continuous narrow channel ...

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7. Audio watermark - Wikipedia

   en.wikipedia.org/wiki/Audio_watermark

   Audio watermark. An audio watermark is a unique electronic identifier embedded in an audio signal, typically used to identify ownership of copyright. It is similar to a watermark on a photograph. Digital watermarking is the process of embedding information into a signal (e.g. audio, video or pictures) in a way that is difficult to remove.