Abstract
We propose a steganography method which hides copyright information in the mean intensity value. The stego-content is dim after embedding the rights information into the digital content so that it is used to prevent the illegal users from piracy and spreading the digit content. And because the file format does not change, anybody without authorization can preview the digital content. The focal points assessed in this model lie in systematic robustness, efficiency and degree of security. We use the mean intensity value of blocks to embed rights information. The more the pixels of a block are, the more hardly the embedded information is altered. The proposed method only needs very low computational complexity. It can apply to digital rights management (DRM) for films and music efficiently because it can extract and verify copyright information in real-time. Moreover, the random number generator is used for generating stego-tables with that the bit stream of authorization information can be hided in blocks. During the embedding procedure, every block that each bit is embedded in generates one shift value. AES (Advance encryption Standard) algorithm is applied to encrypt the shift values stored in a small residual file after embedding procedure. These protect the rights information and digital content and avoid malicious attacks.