向数据多媒体(如图像、声音、视频信号等)中添加某些数字信息以达到文件真伪鉴别、版权保护等功能。嵌入的水印信息隐藏于宿主文件中，不影响原始文件的可观性和完整性。(Some digital information is added to the data multimedia (such as image, sound, video signal and so on) to achieve the function of authenticity identification, copyright