I haven't been there for quite some time but the last time I was I remember downloading every medieval thing I could. The comments box under each model had artist notes and the limitations varied widely. Some were free for anything, some were free for personal use, some asked for donation if used, and some you couldn't do anything with (to which I ask, why bother uploading it in the first place?) They also had a sort mechanism so that you look at everything by one particular artist and there were restrictions there if not on the individual models. So you have to check around on each thing. I just use the models for learning how shadows behave...takes too long for me to build a SketchUp house just to see how the shadows act.