Hi, Russell, interesting story, because there is sort of a cottage or garage industry among homecasters, casting using commerically-made molds and then selling the castings.
In the early days of homecasting molds, from the turn of the last century up through WWII, some mold makers made that a selling point, that a hobbyist could make some money selling the castings.
Of course, we could use the input of a lawyer, to know more about current and specific points of law on this question. It's not exactly like guys who make molds of copyrighted figures and sell the copies (and there are quite a few of those-I know one on eBay who has solid copies of Britains, copies of Imrie-Risley, and others, constantly for sale), but I could see very well that copyright laws-and we're talking international, now, too-might prohibit selling the castings. I'd be curious to know.
The Prins August molds are pretty good, btw, if you ever decide to take up casting. I know some mold makers who poo-poo them, but you can cast a lot of decent figures and fill out a diorama with background figures. And their traditional toy soldier molds make figures that can be modified and converted easily.
Prost!
Brad