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The basic MP3 decoding and encoding technology is patent-free in the European Union, all patents having expired there by 2012 at the latest. In the United States, the technology became substantially patent-free on 16 April 2017 (see below). MP3 patents expired in the US between 2007 and 2017.
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The use of music in a film can cause uncertainty with regard to copyright. As of 2010, it is not known whether the use of music in a film constitutes publication of the music for the purpose of copyright. [5] Unpublished works are treated differently from published works under US copyright law. [6]