The invention provides a digital certificate-based novel digital copyright protection method and a digital certificate-based novel digital copyright protection device, which are used for protecting the copyright of contents of electronic books and digital media. The device consists of a server system and a client system of a computer network service system, wherein the server system comprises an electronic book and digital media content library, a user authentication and authorization service device, a digital copyright certificate making device, a digital content encrypting device, a copyright protection data file making device, and a copyright protection data file publishment and operation service device; and the client system comprises an electronic book and digital media content storing device, a public-key certificate and corresponding private-key safety storage device, a crypto-operation device, a digital content decrypting device, a digital copyright certificate verifying device and an electronic book and digital media content display device. The invention also provides a server device and a client device for digital copyright protection. Through matching use of the two devices, the distribution and storage of the contents of the electronic books and the digital media are realized so as to realize digital copyright protection. The invention is suitable for distribution, publishment and on-line service of the contents of the electronic books and the digital media through Internet, wireless Internet and other communication networks; and the applicable contents of the digital media comprise digitalized characters, pictures, music, movies and televisions and various multimedia digital contents.