This repository contains original work chiefly in c# by the BizHawk team (which is all provided under the MIT License), embedded submodules from other authors with their own licenses clearly provided, other embedded submodules from other authors WITHOUT their own licenses clearly provided, customizations by the BizHawk team to many of those submodules (which is provided under the MIT license), and compiled binary executable modules from other authors without their licenses OR their origins clearly indicated.

Due to the high degree of licensing heterogeneity of this repository and the nature of some of the licenses contained therein, its condition as-is should be considered an illegal combination of several incompatible GPL licenses.

However, if many of the C/C++ emulation cores were removed, the result would be an almost pristine MIT-licensed work. We are therefore providing this repository "under the MIT license" with the expectation that the c# parts of the remaining "frontend" elements authored the BizHawk team is what will be of interest to most people; and besides, those elements constitute the bulk of the original work.

In short, individuals with a keen interest in the licensing details of any portion of this repository should contact us or else assume it is a minefield.

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All of the BizHawk team's original work is provided under this license:
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MIT License

Copyright (c) BizHawk team

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.