然后，本文介绍了数字版权管理的相关知识。

Afterwards, we introduce the Digital Rights Management technology.

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摘要：访问控制问题是数字版权管理中的一个重要安全问题。

Absrtact: Access control has become a difficult and important question of the digital rights management.

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本文从理论、技术、以及软件工程的流程的角度上来研究数字版权管理。

The thesis studied the DRM from different perspectives such as: theory, technology, software engineering theory.

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本文从理论、技术、以及软件工程的流程的角度上来研究数字版权管理。

The thesis studied the DRM from different perspectives such as: theory, technology, software engineering theory.

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