linux内核是基于GPL协议的,而GPL协议要求产生的衍生品都必须使用GPL协议发布 维基百科:GPL授予程序接受人以下权利,或称“自由”: 以任何目的运行此程序的自由; 再发行复制件的自由; 改进此程序,并公开发布改进的自由(前提是能得到源代码)。 所以你能免费使用所有的 linux 系统(另外可以付费获得其它的系统组件或服务,如red hat linux)。 这里有比较流行的 linux 系统可以选择 http://www.linux.org/article/view/selecting-a-linux-distribution
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