[bramblerose]

The MIT license just gives you permission to use the work as published. Normally that work would be in source form, but there is nothing in the MIT license requiring that. In this case, it seems that the authors chose to release the binaries under the MIT license.

[Semaphor]

Just for completeness:

> I open-source pretty much all my work, but TextAnalysisTool.NET is an exception due to a variety of historical reasons. Sorry about that!

-- https://github.com/TextAnalysisTool/Releases/issues/22

[sebazzz]

I wonder what the historical reasons are.

[rdhatt]

It was originally an internal tool, so I would guess either A) he doesn't have permission from all the contributors or B) he used reused code from elsewhere within Microsoft that wasn't open source compatible.