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Reuse of public sector information has been a hot issue for a long time. Reuse of public sector information shall be distinguished from the disclosing or providing public sector information in that disclosing or providing public sector information does not automatically mean that any right to use it is granted since the copyrighted works owned by the public sector institutions ("public copyright") are protected by the Copyright Act. In this article, methods of how to facilitate the use of the public copyright are dealt with, especially by way of so-called open license. For this purpose, systems of European Union, United Kingdom, United States and Australia are assessed in order to suggest our future management of the public copyright and statutory barriers that must be removed for free use of the public copyright. From this assessment, some critically necessary requirements such as free royalty, perpetual license are extracted. Based upon these requirements, lots of legislations in force that prohibit fulfillment of such requirements are pointed out.