[psquid]

#2, "The program must include source code, and must allow distribution in source code as well as compiled form."

Unreal's license for obtaining the source does not permit you to redistribute in source form, so you can't comply with their license and still fulfil that point.

While it's certainly trivial now for most anyone to obtain that source independently, you can't include that source in your own project while still distributing your own project under any license that the OSD would label as open source.

[SXX]

I think there would be huge problem to what count as "your own project source" as it's going to will hugely use UE4 code. So I posted my thoughts on licensing above.