AFAIK, it isn't the case that anything that appears in an EULA necessarily has legal force. There's a story, I don't know if it's true, that Microsoft tried to put in a clause that would prohibit using Microsoft software to write anything that was unflattering to Microsoft. You can't do that sort of thing. There are laws of copyright, and those are what count. If you take a DAZ mesh, shift every polygon randomly a fraction, and then try to publish the result, you have created a derivative mesh and that's bad. If you model the mesh from scratch and then just check that it fits Vicki as suggested by thip above, that's not derivative, even if DAZ would like to define it as so. DAZ does not have the power to change copyright law or the meaning of the English language just to suit its business model.