Hittade detta på Wikipedia:
Fan writers argue that their work does not cost the owner of the source material any income, and often acts as free promotion, while fan writers themselves earn no profit. However, copyright (and trademark) infringement can still occur even when the infringing parties do not profit. The non-profit nature of fan fiction is still important, because it limits the damages that a court could find and also strengthens a possible defense of fair use of the copyright or trademark in question.
Mer på: http://en.wikipedia.org/wiki/Legal_issues_with_fan_fiction
Så ärligt talat tror jag att det inte gör producenterna nåt. Jag ser många tolkningar av Jokern på YouTube, och dom finns kvar.