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There's a good article about this practice here: https://www.gnu.org/philosophy/selling-exceptions.en.html

Usually you wouldn't use the MIT license to do it, but it's the same idea.



Fascinating article, is this common practice? Anyone know of companies successfully selling license exceptions?


Yes, Oracle does this with MySQL. If you want to use MySQL in a way that the GPL doesn’t permit, then you are supposed to buy a license. I have no idea if they are making a lot of money from this.


Qt is primarily LGPL with some GPL modules, and sells commercial dual-licenses.




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