The high-speed computer networks have been fundamental changes in the distribution of digital data and the multimedia download sales overtake the traditional sales. In addition to advantages, there are challenges for multimedia owners which their multimedia are distributed in unsecured form. To protect the data, additional information should be send with the general information. The attack is one of the challenges in video watermarking. In this paper each category of attacks, the main reasons of them and the general solution of them will provide.