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Network developed to make better facilitate the circulation of digital content, digital content owners in order to avoid any of the data is spread, and DRM (Digital Rights Management) system to protect their rights. However DRM systems are limited ways to control use of their data, does not take into account the reasonable use of designs, mainly because the code for fair use (fair use policy) be difficult to design and implement with computer, often there will be needed as the case may be.
本文來自: http://tw.knowledge.yahoo.com/question/question?qid=1011112103915
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