> If I want to use a bit from their UI component generator in my commercial software, am I violating their license? It depends on the license. Based on what I

> If I want to use a bit from their UI component generator in my commercial software, am I violating their license? It depends on the license. Based on what I have read about the cockroachdb, SSPL (mongo) it seems that you can do that (but I am not sure about it, someone more knowledgable might be able to verify it). > This is why real open source is so important to distinguish Consider another case then. You are making a proprietary software that you might or might not be planning to sell and you get the ui generator from an open source software. Are you free to do that? Truth is that just like above the answer is "it depends on the license". GPL will not let you do it while MIT will. LGPL will let you do it if you make the ui generator a library that you dynamically link with and publish your changes to it, while MPL... I have no idea, I think it works on a per-file bases.