Can I modify example game projects and utilize the source for commercial use?

Hi, Dear UnrealEngine Developers.
Join issue.
I have similar question.

Can I use some content (blueprints, textures, materials, sounds, models, etc.) from free example projects (for example StilizedREndering, ElementalDemo, etc.) for commercial UE4 based game?
Can I use it “as is”?
Can I remake/modify it?

Can I use it for free UE4 based game?