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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.
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 ...
It is the process of altering the original data file, allowing for the subsequent recovery of embedded auxiliary data referred to as a watermark . A subscriber, with knowledge of the watermark and how it is recovered, can determine (to a certain extent) whether significant changes have occurred within the data file.
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.
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 ...
Digital rights management ( DRM) is the management of legal access to digital content. Various tools or technological protection measures ( TPM ), [ 1] such as access control technologies, can restrict the use of proprietary hardware and copyrighted works. [ 2] DRM technologies govern the use, modification and distribution of copyrighted works ...
Hardware Watermarking can be performed in two ways: (a) Single-phase watermarking, (b) Multi-phase watermarking. Single-phase watermarking process. As the name suggests, in single-phase watermarking process the secret marks in the form of additional constraints are inserted in a particular phase of design abstraction level.
A number of authentication systems are known by the general term of "watermarking" methods, since they rely on embedding authentication information into another information bearer, by analogy with the watermarking of paper.
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