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自由知識文化日曆/7 月 2 日
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摘自華夏公益教科書，開放世界的開放書籍
1998 年的今天，弗勞恩霍夫協會聖地亞哥 MP3 峰會上宣佈，他們將向 MP3 軟體開發者發出專利侵權警告信。他們在 9 月份開始這樣做。
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書籍：自由知識文化日曆
華夏公益教科書
