Asset license?

Hi,

Im new here and read the thread on exporting games, as well as the https://sbox.game/news/asset-system asset thread.

Ive poked around this website (and it may just be me that cant see it) and was wondering, with all the built in content in the s&box engine, what is the license for it when exporting out? 

Are the assets to be used if publishing only within facepunch server? if we want to publish to steam are we still allowed to use the provided models? 

Thank you