The most common licenses used in open access publishing are Creative Commons.[64] The widely used CC BY license is one of the most permissive, only requiring attribution to be allowed to use the material (and allowing derivations and commercial use).[65] A range of more restrictive Creative Commons licenses are also used. More rarely, some of the smaller academic journals use custom open access licenses.[64][66] Some publishers (e.g. Elsevier) use "author nominal copyright" for OA articles, where the author retains copyright in name only and all rights are transferred to the publisher.[67][68][69]