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自由知识文化日历/2 月 1 日
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来自维基教科书，为开放世界而开放书籍
1992 年的今天，Linux 内核被置于 GNU 通用公共许可证 (GPL) 下以允许将其用于 GNU 操作系统。
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书籍：自由知识文化日历
华夏公益教科书
