Hello Siggis. People has asked before questions along these line, about licensing and so. The times that I have asked the supreme cookies about it, this is what the have said:
“If they create work from a course and want to use it in a project or share it, that’s great! We ask that they mention CG Cookie for attribution. Also, don’t sell it.”
And there’s also this FAQ:
https://support.cgcookie.com/article/251-license-of-project-files
Hope this helps.