Study of Digital Watermarking Based on Network

With the extensive application of multimedia and net work technique recently,it becomes an urgent problem to be resolved that is needed to protect the contents of image,audio and video frequency, etc. In order to protect the copyright,some information can hide in digital media by using digital watermarking technique.And it's a studying point at issue recently. Some general concepts and characteristics about digital watermarking technique,watermarking system models and the typical algorithm about watermarking embedding are introduced.