SureStream is an authoring option that makes it possible for the content you are receiving to be optimized for your current connection conditions, without interrupting your experience. You choose one link, and RealOne Player handles the rest.
SureStream will automatically upshift, or increase the quality level, of the content you're playing if your Internet connection can handle the bit-rate. If the connection experiences congestion later on, SureStream will automatically downshift the quality but continue playing your selection.