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The game is written in the [[Python (programming language)|Python]] programming language, and is licensed under the [[GNU General Public License]], although the game incorporates other [[free and open-source]] code under other [[Software license|licenses]]. The game's included song files and some internal fonts are [[Proprietary software|proprietary]], and their redistribution is not permitted outside of the Frets On Fire executable.<ref name="license">{{cite web | url = http://fretsonfire.svn.sourceforge.net/viewvc/fretsonfire/trunk/copying.txt?view=markup | title = Frets on Fire license | accessdate = 2007-04-20 | work = Frets on Fire Subversion repository | publisher = [[SourceForge.net]] }}</ref>
As there has not been an updated stable release of the original Frets on Fire since 2010, many former users have begun using Phase Shift, as it supports the use of song files originally created for Frets on Fire and offers more current support.{{Citation needed}}
==Gameplay==
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