And my problem is that I don't know anything about the laws concerning this kind of stuff. Okay, well, this is basic contract law. You sell him X, and, he gives you Y for compensation. Very often, when we work for a major company...We actually sign away our rights to our OWN intellectual property, in the initial employment contract....and, most of us do not realize this...check out a C&D thread from the techtip girl, betsy, from Daz..do a search. My father lost a grand fortune, in this manner. He created all the plans for the machines that made the very first metal/plastic twist off caps for beverages. Had he paid attention, I would still be getting many, many residuals, today, since my parents, and, one sibling are deceased. If it was me....I would not give the buyer control of the actual models you created. I know it is some of hard times for us, since 9-11. I know a large monetary offer is very, very attractive. However, you must do some smart thinking...give him user rights...but not..EXCLUSIVE user rights. Stand firm on that. You did not sign an employment agreement with him. If he wants them badly enough, and it does sound as if his company really needs them...play it like poker. Very good luck to you. Pop...Pop...Poppi!!!