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自由知识文化日历/7 月 2 日
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摘自维基教科书，开放世界的开放书籍
1998 年的今天，弗劳恩霍夫协会圣地亚哥 MP3 峰会上宣布，他们将向 MP3 软件开发者发出专利侵权警告信。他们在 9 月份开始这样做。
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书籍：自由知识文化日历
华夏公益教科书
