praxis, If the orginal mesh is combined, in whole or in part, with another mesh, it still is propriatory.If here was someone combining a skirt from one figure with a top from another and sleeves from another. Three creators had their work stolen. Of course, if they saw the orginal and liked it, they may have made a mesh from scratch that resembles the original but didn't use any parts from it. That's legal, so long as they didn't use the orginal as a base. Again, it becomes very hard to prove when the mesh has been dramaticly changed.