License
Mono is dual licensed by Xamarin, similar to other products such as Qt and the Mozilla Application Suite. Mono's C# compiler and tools are released under the GNU General Public License (GPLv2 only) (starting with version 2.0 of Mono, the Mono C# compiler source code will also be available under the MIT X11 License), the runtime libraries under the GNU Lesser General Public License (LGPLv2 only) and the class libraries under the MIT License. These are all free software and open-source licenses and hence Mono is free and open-source software.
The license of the C# compiler was changed from the GPL to the MIT X11 license to allow the compiler code to be reused in a few instances where the GPL would have prevented such:
- Mono's Compiler as a Service
- The Mono interactive Shell
- The Mono embeddable C# compiler
- Mono's implementation of the C# 4.0 dynamic binder.
- MonoDevelop's built-in parser and AST graph
Read more about this topic: Mono (software)
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