Wavelet based copyright protection

It is well known that a digital signature scheme is a well-defined security method for copyright protection. For this reason, construction of digital watermarking has received considerable attention for copyright protection. Unfortunately, the proposed watermarking schemes have some deficiencies. Here, cryptographic tools will be introduced into watermarking schemes, in such a way that both the advantages of cryptographic tools and digital watermarking are available. The publicly verifiable and tolerant distortion properties are possible for this case. Based on this idea, apart from the conventional watermarking techniques, a lossless and robust copyright-protection scheme is proposed.Our scheme is capable of resisting common image processing, geometric distortions and some intentional attacks. Unfortunately, proposed watermarking method still has some weakness for a few numbers of the attacks.The robustness property has been proved conducting for a series of experiments. As specialy, the StirMark attacks are adopted as benchmark verification of the proposed method.