关键词: 数字版权保护（DRM）, 特征图像, 机器指纹, 用户域, 遍历加密

Abstract: Digital Rights Management（DRM） is becoming a key technology to protect intellectual property of digital contents. Considering the demand of digital content market and the shortcomings of current DRM systems, this paper presents a cryptography-based DRM scheme, which extracts encrypt key from an image dynamically and makes the key choice and updating more flexible. At the same time, to enhance significantly the security of DRM system, a triple-stage encryption mechanism is adopted in the system. Furthermore, user domains are formed using ergodic encryption so that the license can be bound with multiple devices, which allows a user to share digital contents on various devices he owns. The security of the program is proved, the simulation result of operational efficiency and the result of comparison with several mainstream DRM solutions are given.

Key words: Digital Rights Management（DRM）, characteristic image, device fingerprint, user domain, ergodic encryption