The license of this project depends on the license of snes9x, snem, and emscript snes9x is a freeware for PERSONAL USE only. see https://github.com/snes9xgit/snes9x/blob/master/docs/snes9x-license.txt snem claimed to be open source but not sure wich license it is. I sent an email to the author asking for the license(2 years ago), but have not get response yet. mscripten is available under 2 licenses, the MIT license and the University of Illinois/NCSA Open Source License. https://github.com/kripken/emscripten/blob/master/LICENSE All my modifications, if applicatable, are under public domain.