Residents of certain states banning payment of an entry fee, or other payments, for participation in a game of skill can’t enter the National Geographic magazine photography contest, which requires a $15 entry fee from participants.
That means, the National Geographic Web site warns, “Contest is void in Cuba, Iran, New Jersey, North Korea, the Province of Quebec, Sudan, Syria, Vermont and where prohibited.”
Source: Michael Zhang, “Why Photogs in Certain States Can’t Enter Nat Geo’s Photo Contest,” PetaPixel, October 28, 2012 h/t overlawyered