Television broadcasters were handed a major legal victory on Wednesday as the U.S. Supreme Court decreed by a 6-3 margin that Aereo’s method of streaming live television broadcasts through a network of thousands of tiny dime-size antennas assigned to individual customers violates broadcaster copyrights. The ruling deals a crippling blow to Aereo, Inc., a two-year-old upstart that, until Wednesday, had scored a series of lower court wins that proclaimed the legality of the company’s business model and technology. Specifically, the high court ruling addresses the broadcast networks’ appeal of the April 2013 decision of the Second Circuit court denying injunctive relief against the Aereo streaming service. Upholding a lower district court ruling, the Second Circuit concluded that Aereo’s method of transmitting live television broadcasts over the Internet did not constitute a “public performance” for the purpose of copyright law and therefore did not infringe upon broadcaster copyrights. However, writing for the Supreme Court majority, however, Justice Stephen Breyer stated that Aereo “is not simply an equipment provider” that enables its subscribers to “perform” copyrighted works privately as well as individually. Instead, the Court decreed, “Aereo, and not just its subscribers, ‘performs’ (or ‘transmits’)” copyrighted broadcast programming which makes the activities of Aereo “substantially similar to those of the CATV [cable] companies that Congress amended the [Copyright] Act to reach.” Emphasizing that the court’s ruling is limited to the Aereo service, Breyer further noted that resolution of related questions that concern cloud computing, remote storage DVRs, “and other novel matters now before us should await a case in which they are clearly presented.” The majority’s opinion, however, failed to sway dissenting Justices Antonin Scalia, Clarence Thomas and Samuel Alito. Arguing that “Aereo does not ‘perform’ at all,” the dissenters proclaimed that “the Court manages to reach the opposite conclusion only by disregarding widely accepted rules for service-provider liability and adopting in their place an impoverished standard (“looks-like- cable-TV”) that will sow confusion for years to come.” In his written dissent, Justice Scalia added, “the key point is that subscribers call all the shots: Aereo’s automated system does not  relay any program, copyrighted  or not, until a subscriber selects the program and tells Aereo to relay it.” A spokesman for the Walt Disney Company, the parent of the ABC broadcast network, praised the justices for upholding “important copyright principles that help ensure that the high-quality creative content consumers expect and demand is protected and incentivized.” Aereo  CEO Chet  Kanojia meanwhile decried  the ruling as a “massive setback” that “sends a chilling message to the technology industry.” Asserting, “our work is not done,” Kanojia vowed:  “we will continue to fight for our consumers and fight to create innovative technologies that have a meaningful and positive impact.”