Reading comprehension seems to be a lost art. From the contest rules: "By entering the Contest, Entrants represent and warrant that they have obtained all of the rights, licenses, and permissions in writing from any person who may have helped create the Entry (or from an appropriate parent/legal guardian if any such person(s) is considered a minor in their eligible country of residence);" As it was Nvida that picked the finalists for their own contest, I would assume they checked to make sure what they were picking was following their own rules. Several of the mods picked seem to have credits, thank yous, etc. and this is certainly far from the first contest of this sort they have run.