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Digital watermarking is used to hide the information inside a signal, which cannot be easily extracted by the third party. Its widely used application is copyright protection of digital information. It is different from the encryption in the sense that it allows the user to access, view and interpret the signal but protect the ownership of the content. One of the current research areas is to protect digital watermark inside the information so that ownership of the information cannot be claimed by third party. Digital watermark can be visible or invisible embedded in a multimedia document for copyright protection. With a lot of information available on various search engines, to protect the ownership of information is a crucial area of research.
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