Digital Watermarking Hiding Technology for Copyright Information With the wide application of information technology and the gradual development of army informationization construction, especially with the development of computer network communication technology, data exchange and transmission has become a relatively simple process, people can easily transmit data through various devices; however, the security problem of information transmission has arisen. Digital watermarking technology emerged in the 1990s as an important branch of information hiding technology. It determines the ownership of digital products or verifies the primitiveness of digital information content by embedding perceptible or imperceptible watermarking information in digital products. Firstly, this paper expounds the basic theory of information hiding and related theories. On this basis, it introduces the general classification of digital watermarking technology, and puts forward various forms of digital copyright information.

Blind Multipurpose Image Watermarking Based on Secret Sharing In this paper, in order to accomplish two goals of multimedia authentication and copyright protection, we present a multipurpose watermarking method based on a commonly used cryptographic primitive called verifiable secret sharing scheme. Utilizing this primitive, our scheme achieves blindness meaning that it needs neither the original host image nor the embedded watermark. Our scheme also does not need two distinct watermarks to authenticate the images and at the same time protect their copyright. Experimental results show that the features of the shares, obtained by the used primitive from watermark, enables our method to reconstruct extracted tampered watermarks after various attacks such as JPEG compression, cropping, salt and pepper noise, median filtering, some combined attacks, etc. Comparisons are provided with other multipurpose watermarking methods which primarily aim at protecting copyright of media and authenticating it simultaneously. We also show the superiority of our proposed method to three watermarking methods attaining the goals of copyright protection and authentication.