Hi, Twrmois,
With the agreement of Unity 3D Asset, section 3.8:
==================================================================
You agree that Unity and/or third parties own all right, title and interest in and to the Unity Asset Store and the Assets available through the Unity Asset Store, including without limitation all applicable Intellectual Property Rights in the Unity Asset Store and Assets. "Intellectual Property Rights" means any and all intellectual property rights wherever in the world and whenever arising (and including any application), including patent laws, copyright, trade secrets, know-how, confidential information, business names and domain names, computer programs, trademark laws, service marks, trade names, utility models, design rights, semi-conductor topography rights, database rights, goodwill or rights to sue for passing off, and any and all other proprietary rights worldwide. You agree that you will not, and will not allow any third party to,
(i) copy, sell, license, distribute, transfer, modify, adapt, translate, prepare derivative works from, decompile, reverse engineer, disassemble or otherwise attempt to derive source code from the Unity Asset Store or the Assets, unless otherwise permitted,
==================================================================
The agreement asks buyers for not selling prepare derivative works from.
And you mentioned: "Any money you make with your game is yours and none of it is owed back to UFE. This applies to all versions of UFE.", That's an extended permission from you, therefore, the extended agreement will be required from the legal department, would you please provide the text file?
Best Regard,
Dennies