In this paper, the author discusses the impacts of copyright protection on digital library, and the construction of digital library how to keep to fair use in Copyright Act.

本文通过近几年国内外及世界版权组织版权法的分析，探究版权保护对数字图书馆的影响，以及在数字图书馆建设与服务过程中如何遵循合理使用制度等问题。

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More recently, a revision of the U.S. copyright Act in 1976 extended copyright protection to unpublished works and codified what constitutes "fair use."

更近一点，1976年美国对Copyright Act的修订，将版权扩展到保护未出版的作品，并编写了“正当使用”的条款。

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In cyberspace there exist some new forms of fair use of copyright, a significant one of which is "reasonable limitation of technological measures".

在网络空间，著作权合理使用也存在新的形式，“技术措施合理限制制度”是其中一个十分重要的制度。

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Regarding Napster's claim that its users were not infringing copyright because sharing copyrighted musical compositions and sound recordings via the Napster service is protected by the "fair use" doctrine, the court held that the four fair use factors in the Copyright Act tip the balance in the record companies' favour.

BBC: Napster ruling: The legal issues

The defense is hoping that "the Second Circuit or the Supreme Court will see that this restriction on fair use of media doesn't fit with the copyright clause in the Constitution, " she said.

CNN: MPAA pursues people who post link to DeCSS code

In fact a balanced copyright system, including fair use, is one of the key reasons why products like search engines, YouTube, Facebook, and thousands of other Internet companies are commercially viable in the first place.

FORBES: FTC's Google Settlement a "Third Way" Approach for Antitrust Enforcement