Yes, the code is MIT licensed. Check it on github: <a href="https:&#x2F;&#x2F;github.com&#x2F;microsoft&#x2F;referencesource" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;microsoft&#x2F;referencesource</a><p>In fact, for the past couple releases mono has replaced a lot of its library code with MS&#x27;s quite successfully.<p>Full disclosure - I run the mono team at Xamarin.