Hello,
I was reading this answer (last one) General Public License (GPL, or “free software”) - Platform & Builds - Epic Developer Community Forums but still do not understand it.
Example: I will download object.fbx with CC SA license and use it into my game. I will package game and distribute it with object.uasset.
When someone wants object.uasset - he can. He can download my packaged game and copy and use object.uasset from it.
Ok, when you want to open object.uasset you need to use UE4 and agree with EULA. But CC SA does not demand that you need to have chance to open that format. It is same like when I will pack object.fbx into zip archive - still nobody have right to access source codes for zip archiver or right to even use zip unarchiver. Why is CC SA denied then?