Broadcast and cable TV are not dead yet.

In a decision that could crimp consumers' hopes to cut the cord from their cable operators, the U.S Supreme Court said Aereo Inc., a video streaming service backed by media mogul Barry Diller, violated copyright law by using tiny antennas to broadcast TV content online to paying subscribers.

Wednesday's 6-3 decision, written by Justice Stephen Breyer, is a victory for traditional broadcasters such as CBS Corp., Comcast Corp.'s NBC, Walt Disney Co.'s ABC, and Twenty-First Century Fox Inc.'s Fox.