I will just paste a response given by the Marketplace team when they asked the Legal department (the thread is in the Creator’s Hub and you need access there, if you are a MP Creator just ask to the support):
03-11-2018, 01:01 AM
Originally posted by CodeSpartan
I need to include into my assets some content that is under CC BY license. I see the EULA specifically states that CC BY-SA is forbidden, but what about CC BY?
Envato Market explicitly allows CC BY, but forbids CC BY-SA.
Under CC BY, I am under obligation to credit the authors, but my customers wouldn’t be legally obliged to, so I’m guessing this doesn’t contradict EULA in any way. Am I correct?
which WellActually answered:
"Good news. Our Legal team says CC BY does not have the viral portions of CC-BY-SA, so Epic does not consider it a "Non-Compatible License”
Hope this helps!"