        Abtract: Trình bà                           Keywords:              Content                                    ,         , . , , hình , âm thanh,            ,                     Một số phương pháp bảo mật và xác thực bản quyền ảnh số -                        -  -  -     Reference: Tiếng Việt [01] -   [02] -  Tiếng Anh [03] -  Artec House. [04] -  Magazine of IEEE Multimedia. [05] -  Proceedings of IEEE. [06] - http://en.wikipedia.org/wiki/Discrete_cosine_transform [07] - http://en.wikipedia.org/wiki/Modulo [08] - http://sports.tmcnet.com/news/2011/01/17/5247713.htm [09] - http://vi.wikipedia.org/wiki/Mã_Hamming [10] - http://www.watermarkingworld.com [11] - http:// www.mathworks.com .  Một số phương pháp bảo mật và xác thực bản quyền ảnh số  -