Date Added: Jul 2012
As digital media has made the people life more colorful because of its advantages like easier to access, copy and distribute. But as what the authors have seen, series of malice activities like copyright infringement, counterfeiting, piracy and information distortion make damages to both the producers and the users of digital products. So they really need some technology to protect the copyright, authenticity, integrity of the digital products and the intellectual property of the users. There are many techniques such as Digital watermarking and Visual Cryptography both have been widely used for protection of data either in text, video, sound or digital images form in modern network time.