"Doing its best to turn lemons into lemonade, Aereo now seeks to capitalize on the Supreme Court's comparison of it to a (cable) system," U.S. District Judge Alison Nathan said in her ruling.
Aereo's contention that this means it actually is a cable system is a "fallacy," she said.
Since her ruling now matches decisions against Aereo in other parts of the country, she said the broadcasters are entitled to a nationwide preliminary injunction.
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Aereo, she said, "cannot claim significant hardship if an injunction issues, while Plaintiffs can still claim harm if an injunction does not issue."
"We are reviewing the decision and evaluating our options moving forward," Aereo spokeswoman Virginia Lam said.
Nathan offered Aereo some consolation in refusing the broadcasters' demand she also bar delayed programs. The two sides will have to explore that issue in arguing over a permanent injunction.
Aereo's future became imperiled when the Supreme Court ruled on June 25 that the company had infringed broadcasters' copyrights by capturing live and recorded programs through antennas and transmitting them to subscribers who paid $8 to $12 a month.
In an emergency plea to Nathan in August, Aereo asked that it be allowed to operate like a cable system, saying it was "figuratively bleeding to death," but the judge denied the request.