Today’s world is digital world. Nowadays, in every field there is enormoususe of digital contents.Information handled on INTERNET and MULTIMEDIA NETWORK SYSTEM is in digital form.The copying of digital content withoutquality loss is not so difficult.Due to this,there are more chances of copying ofsuch digital information.So,there is great need of prohibiting such illegalcopyright of digital media.Digital watermarking(DWM) is the powerful solutionto this problem.Digital watermarking is nothing but the technology in which thereis embedding of various information in digital content which we have to protectfrom illegal copying.This embedded information to protect the data is embedded as watermark.Beyond the copyright protection,Digital watermarking is having some other applications as fingerprinting,owner identification etc.Digital water-marks are of different types as robust,fragile,visible and invisible.Application isdepending upon these watermarks classifications.There are some requirementsof digital watermarks as integrity,robustness and complexity.
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