Is it legal to sell fan art on redbubble?

Related questions

1. Are DeviantArt images copyrighted?
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5. What can you do with DeviantArt points?
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Tags

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2. #which
3. #intellectual
4. #important
5. #based
6. #understand
7. #selling
8. #permission
9. #things
10. #their
11. #property
12. #because
13. #certain
14. #anywhere
15. #redbubble
16. #partner
17. #someone
18. #artwork