Integrate free ue4 software with a game client that is not 100% free

Thanks very much. Just to be clear, if I make that map_editor (in this case, for my game), and do not distribute that software (I only use it myself to create maps for the game), then I have to pay royalties because part of the game (the maps) would have been created in part by UE, correct?

In a sense, it feels correct, and it a sense, it feels wrong, depending on what exactly the map editor is doing.

For example, if the map editor is simply using UE as a UI toolkit, and the maps generated are created using custom algorithms, then it doesn’t feel right.

This is like saying, I use UE to create the walls of my store, and then I need to pay royalties for the clothes I make/sell.