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by adventured 3809 days ago
You can in fact fork it. You can do almost anything you want to with it, so long as you obey the EULA and pay any royalties owed.

https://www.unrealengine.com/faq

"What modifications can I make to the source code?"

"You can extend it, modify it, fork it, or integrate it with other software or libraries, with one exception: You can’t combine the Unreal Engine code with code covered by a “Copyleft” license agreement which would directly or indirectly require the Unreal Engine to be governed by terms other than the EULA."