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The success of Sci-Hub, which relies on researchers passing on copies they have themselves legally accessed, shows the legal ecosystem has lost legitimacy among its users and must be transformed so that it works for all participants.

句子主干：The success of Sci-Hub shows(主语+谓语)。

修饰成分：which relies on researchers passing on copies they have themselves legally accessed定语从句，修饰the success of Sci-Hub;the legal ecosystem has lost legitimacy among its users and must be transformed宾语从句;so that it works for all participants结果状语从句。

翻译：Sci-Hub的成功依赖于研究人员可以传播他们自己合法获取的副本，这表明合法的科学出版生态系统已经在用户中失去了公正合理性，所以必须得到改变以服务所有参与者。