Back when UE4 was first released I asked that question in relation to training simulations within larger courses and the answer was that, as no software was bei

Back when UE4 was first released I asked that question in relation to training simulations within larger courses and the answer was that, as no software was being sold, then no royalties would apply! (just the $20/mo subscription cost at the time) Definitely contact EPIC and get a ruling on your specific case, but I was blown away! In the end we didn't go ahead with those simulations as the html5 support wasn't quite ready at the time.