If you just hand over the finished (and encrypted) game, I see that as nothing different than creating a game to sell on a marketplace. That would be fine.
I'm not sure about open files the client will be editing, as they'd be actively using the tileset and obtained a copy of it they did not pay for, so they'd probably need to buy it too.
Plueschkatze
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Most of the tiles work without an issue in other engines, but all the wall and floor autotiles are specifically set up for RPGM, so unless you know how to work around this, I'd say you can't use them without issues.
If this is only about permission to use them with other engines than RPGM, yes, you are allowed to use them in any engine.
Edits are allowed for usage within your project. You aren't allowed to share or sell the edited assets.
I'm ok with you handing the files to a commissioned artist for them to work with those files. They aren't allowed to use the art assets (original or edited) on their own project (they'd need to buy their own license for that) and are not allowed to sell the edits they made as an asset pack, to other clients, or in whichever other way. ;3











