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自由知识文化日历/4 月 26 日
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来自 Wikibooks，开放世界中的开放书本
今天是世界知识产权日。想象一下，如果你垄断了全人类的技术进步，并且对他人保密，你会从他人那里勒索到多少财富！
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书：自由知识文化日历
华夏公益教科书
