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With the rapid development of mobile communication, portable devices such as cell phone and tablet computer have been more and more widely used. Traditional publishers have come to realize the rising business value of mobile digital publishing. However, convenient reading and communication pattern brings not only the benefits but also some disadvantages. Rights protection of the digital publications is one of the most important problems. The OMA DRM system is a popular solution to establish digital rights management, but it is designed for desktop computer network from the beginning. Problems may uncover when it is used in mobile network. In this paper, we introduced a mobile digital rights management application system based on agent technology which made some improvement for mobile network environment.