This seems to revolve around Ferrari, John. Did you contact Ferrari about what their guidlines are? There are lots of copyrighted things for sale also that contain the "Royalty Free" clause. There will always be a grey line about this unless you go directly to the source, and get your answers there. You might also go ahead, make your demo, and let them review it before release to the general public. Most vendors are always happy to let people glorify their products, however Ferrari may not be real fond of you letting their cars explode like a Pinto :o)