Qt uses the LGPL, not GPL: <a href="http:&#x2F;&#x2F;www.qt.io&#x2F;FAQ&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.qt.io&#x2F;FAQ&#x2F;</a> - you&#x27;re right about the linking stuff. But that means opening stuff in ways that is probably undesired, e.g. embedded devices.<p>In the case of this MIT-licensed work, IANAL but there seems to be no way to require users to buy the commercial license because the MIT license already allows this usage.