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自由知識文化日曆/2 月 1 日
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來自華夏公益教科書，為開放世界而開放書籍
1992 年的今天，Linux 核心被置於 GNU 通用公共許可證 (GPL) 下以允許將其用於 GNU 作業系統。
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書籍：自由知識文化日曆
華夏公益教科書
