To implement WIPO Copyright Treaty, China and many other countries have amended the copyright law to protect both the “access control measures” which restrict unauthorized access to literal, artistic works or computer programs, and the “copyright protection measures” which prevent unauthorized reproduction, transmission or other infringing activities. The protection of the “copyright protection measures” by the copyright law is easy to be justified since this type of technological measure is a means to protect copyrights. However, unauthorized access to copyrighted works, including reading or watching pirated novels or movies, does not infringe the copyright, so the effect of the “access control measures” is not to protect copyrights. Therefore, the justification for protecting the “access control measures” by the copyright law becomes a highly controversial issue.One explanation bases the justification on the view that the “access control measures” can directly protect the exclusive right of reproduction by restricting temporary copying and the so-called exclusive “right of access” by restricting unauthorized access to works. This explanation is not well grounded since the “access control measures” cannot protect the right of reproduction in a country such as China where the temporary copying is not covered by the right of reproduction, and the hypothetical “right of access” does not actually exist in the copyright law. Another argument is that the “access control measures” have the effect of indirectly preventing copyright infringement by restricting access to works. But the fact is that only very limited number of “access control measures” can protect copyrights indirectly. This paper proposes that the justification for the copyright law to protect the “access control measures” arises from the fact that the measures can safeguard copyright owners’ legitimate interests recognized by the copyright law, i.e., to receive financial benefit from others’ exploitation of the works. In accordance with this theory, if an “access control measure” does not safeguard such legitimate interests, it should not be protected by copyright law. |