Ultraviolet is a digital movie locker system that allows users to store copies of movies they own on DVD or Blu-Ray. With Ultraviolet, users can stream and access their movie library across multiple devices. It provides HD streaming through Vudu and SD streaming through Flixster, though the library available for streaming varies between services. While Ultraviolet gives users portable access to their movie collection, it still has limitations for streaming on devices like Google TV due to a lack of unified apps and full HD streaming support.