The legal saga of Aereo, a start-up that offers an $8-per-month TV streaming service, entered a new chapter last week as a California court heard arguments over whether to lift a ban preventing Aereo-style technology from going live in the western United States. The California hearing was just the latest twist in a complex series of cases that many lawyers predict could land before the Supreme Court and redefine the rules for TV. By the time that happens, however, rapidly expanding Aereo or some other streaming service may have already disrupted the current business model for television. Here’s a quick primer of where the case stands, and why time is on Aereo’s side. If you’re unfamiliar with Aereo, the Barry Diller-backed start-up provides tiny antennas that allow subscribers to watch and record Aereo antennasover-the-air TV via iPhones, laptops and other mobile devices.