If I use brushes/textures/renders from deviantart/planetcricket in any national competitions, is it compulsory to mention/credit/pay them all for it? Just asking because I'm 'bout to participate in an upcoming competitions, and I don't really remember all the sources of brushes and textures I have. A lot of them are freebies, and I cbf searching for their pages again and again to see which of them are.
you can play safe and accredit in a manner like "credits to the respective owners"
just like films.
ntl some people are just contrary to this, let them be hellbent. You should check what are freebies though.