1. Y. Wang, J. Xiao and Y.H. Wang, Digital Watermarking Principles and Techniques, Beijing: Science Press, pp.1-6, 2007. (In Chinese).
2. Q.D. Zhou, Research on Digital Image Copyright Protection Based on Non-watermarking, Wuhan: Huazhong University of Science & Technology, pp.9-12, 2004. (In Chinese).
3. Q. Wen, Research on Robustness and Imperceptibility of Multimedia Digital Watermarking, Jilin: Jilin University, 2005. (In Chinese).
4. Q. Mao, Y.X. Yang and T.N. Tan, The Research of Secure Digital Watermarking Architecture, Journal of Electronics and Information Technology. vol. 23(9), pp.833-840, Sept. 2001. (In Chinese).
5. Daniel Augot, Jean-Marc and Jean-Francois, Secure delivery of image over open networks, Proc. IEEE, vol. 87(7), pp.1251-1266, July (1999).