I'm talking about mass-market manufacturers, not some guy in his basement casting bodies. Obviously most "one man band" resin casters don't have licenses to sell what they sell, but their sales volume is so small in the overall scheme of things that the big guys probably don't even notice them (or care).
But if a "real" kit maker like Revell or Round2 decided to get into the 3-D printing kit business, either via download sales or as disks sold in "brick and mortar" stores, they would have licensing deals in place just as they do now for their injection-molded kits.