Limitation for submitted content.

Hi everyone,

I do not really understand couple of things. Some authors put few things in their submitted content from another authors work. Let’s say “projectiles” set contains a shotgun from another authors set. Moreover in “projectiles” set it is written that the shotgun is taken from ****** author set and not included into license. Is it way allowed?

Another thing is connected to copyright. Let’s say I am making projectiles or some other things without super original recognizable textures. Do I need to make a copyright for my set I am going to upload into UE4 store?

Can you please show the example links?
As I know creators only able to show someone work with attention text on screenshots but not in a project itself.
All products that distributing on Marketplace are have a Unreal Engine Markeplace Agreement.
More about you can read here: Marketplace Guidelines - Unreal Engine and EULA - Unreal Engine

I can not find it right now, because I have seen it couple of weeks ago.