A Terminal Digital Interface Content Protection System Based On Digital Watermark

With the development and popularity of digital television and internet, the spread about the contents of digital multimedia is becoming more and more convenient and shortcut, but the corresponding protection of intellectual property lags and the illegal copy of the digital television content are becoming more and more severe. According to the statistic of International Intellectual Property Alliance (IIPA), the actions of piracy about 90% are through to decrypt the data of terminal interface and then they copy and transcribe the decrypting data. In view of this, protecting the output content of the digital interface of the terminal devices becomes an important issue to protect the copyright of multimedia. In the article, according to the technologies of the digital watermark, the cryptographies and so on, a high-definition digital content protection system is provided and achieved.HDCP is a common way to protect the terminal interface in .At first, the main features of HDCP are introduced. And then the main several protective technologies for the terminal interface is expatiated on.Based on a Mini2440 platform, designing a protection system of the high-definition video transmission interface includes three subsystems: a video transmitter, a video receiver and a user certificate server. The video transmitter is designed for the little key managing strategies, encryption update strategies, the video watermark embedding strategies and real-time video transmission strategies to the connection of connect multiple users. The video receiver is designed for the strategies of real-time receiving video, the video watermark extracted strategies, the decryption strategies and the strategies of real-time playback video. While in the user certificate server, a problem about the update of user certificates is solved and a operational solution is provided for the content providers. The results show that the interface protective system, based on the technologies of digital watermark at the platform of Mini2440, has the better security and provides the good encrypting services for the transmission of high-definition videos, which not make the authentication devices abnormally receive and play but make the authentication devices normally receive and play. The goal of protection for the interface is achieved.