That's Got to be a Really Thin Copyright. USA Today reports that "Christian group backs off case against blog parody." From the article: "Exodus International initially claimed the altered image of one of its billboards by Justin Watt infringed its copyright. But Exodus is no longer pursuing the matter after Watt stopped using its 'watermark' logo, Exodus President Alan Chambers said." You can see the images at issue over at Marty's.