Hello, I am from Russia and I have a question if I make a game on your engine and want to sell it, for example, in steam. Do I have to give part of the money from sales or do I need to buy an engine before creating a game? Thank you in advance

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There is a form you need to fill. You report your revenue and royalties to Epic on a quarterly basis. Also you need to contact or inform them before you release your game or project to the public. you can write them licensing@unrealengine.com