Digital Watermark | Digital watermarking

Digital watermark Also referred to as simply digital watermarking, a pattern of bits inserted into a digital image watermark, audio digital watermarks or video digital watermarks file that identifies the file's copyright information (author, copyrights, etc.). The name comes from the faintly visible digital watermarks imprinted on stationery that identify the manufacturer of the stationery. The purpose of watermark is to provide copyright protection for intellectual property that's in digital format.

Unlike printed watermark, which are intended to be somewhat visible, digital watermarks are designed to be completely invisible, or in the case of audio clips, inaudible. Moreover, the actual bits representing the digital watermark must be scattered throughout the file in such a way that they cannot be identified and manipulated. And finally, the digital watermark must be robust enough so that it can withstand normal changes to the file (Removing digital watermarks), such as reductions from lossy compression algorithms, batch watermark software.

Satisfying all these requirements of digital watermarking is no easy feat, but there are a number of companies offering competing technologies. All of them work by making the digital watermark appear as noise - that is, random data that exists in most digital files anyway. To view a digital watermark, you need a special program that knows how to extract the digital watermark data.

Watermarking is also called data embedding and information hiding.

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