We plan to use the Unreal Engine for research and development (and perhaps in a later stage for a product) in the field of command & control systems for firefighters, rescue services and police forces.
In the license FAQ, we have read that there is a special “Enterprise” license for non-game development.
We are unsure, if for such use cases the same license models as for games apply: i.e. 5% royalty on gross product revenue after the first $3,000 per game per calendar quarter from commercial products.
To be more precise: can we use Unreal Engine 4.20 free of charge during a testing and development phase during which we do not sell a product, even though we are not intending to develop a game?