Digital 3-D cinema could be the motion picture industry's strongest defense against piracy, Titanic director James Cameron said Sunday. Speaking at the National Association of Broadcasters' Digital Cinema Summit in Las Vegas, Cameron said that Digital 3-D "offers a powerful experience which you can only have in the movie theater." He lauded technology that permits virtually any film to be transformed into a 3-D version, and indicated that he is considering releasing his 1997 blockbuster Titanic in 3-D. "Digital 3-D is a revolutionary form of showmanship that is within our grasp. It can get people off their butts and away from their portable devices and get people back in the theaters where they belong," he said.