Abstract
Abstract Compulsory license means that someone who conforms the elements of the laws can make the applications to the authorities and use the works that did not authorized after paying the royalty. Royalty is the important content of the authorization, it is the price that the licensee to use the works, and the reward for the creator. Licensees enhance the right to control and to use by the means of pay the royalty. Royalty can not be got at once, it can be paid based on different agendas, different people and different conditions, just like the tax system. Because of WTO, the compulsory license of translation is excluded in Taiwan, and the license just apply to the musical works. Key Words: Copyright, Compulsory License, Royalty, Musical Works