By Patrick Fitzgerald 

Aereo Inc. has filed for bankruptcy protection five months after the U.S. Supreme Court delivered the Internet-broadcast streaming company a fatal blow in its fight with traditional television broadcasters.

Aereo Chief Executive Chet Kanojia said the court ruling was insurmountable for the company, which served subscribers through thousands of dime-size antennas stored in warehouses to capture local broadcast signals.

"The U.S. Supreme Court decision effectively changed the laws that had governed Aereo's technology, creating regulatory and legal uncertainty," Mr. Kanojia said on the company's website. "And while our team has focused its energies on exploring every path forward available to us, without that clarity, the challenges have proven too difficult to overcome."

The ruling in June was a victory for media companies like CBS Corp., Walt Disney Co.'s ABC, Comcast Corp.'s NBC and 21st Century Fox's Fox, who said Aereo was unlawfully exploiting their copyrighted works without permission or payment.

Using individualized antennas, Aereo subscribers could stream local TV stations' signals through the company's cloud-based antenna and DVR services for as little as $8 a month. It suspended the service, whose biggest markets were Boston and New York, after the Supreme Court ruling.

Aereo filed for Chapter 11 protection late Thursday in U.S. Bankruptcy Court in New York, listing assets of $20.5 million and debt of $4.2 million.

The Boston-based company, whose equity backers include Barry Diller's IAC and funds managed by Highland Capital, raised approximately $95.6 million in venture cash since its founding in 2010.

In the wake of the Supreme Court's decision, which ruled that Aereo was "substantially similar" to a cable system and therefore needed broadcasters' permission to air their content, Aereo pushed for regulatory change that would offer it the benefits of being classified as a cable system. These included being able to qualify for a compulsory copyright license that would allow it to pay limited royalties for the rights to broadcast content.

The company made some headway. Following a meeting with Aereo executives in October, the Federal Communications Commission proposed classifying online live-TV providers as "multichannel video programming distributors" like cable and satellite providers. Some Aereo investors said last month they hoped the possibility of such a classification could create a path forward for the company.

But in an affidavit filed with the bankruptcy court, Aereo finance chief Ramon Rivera said that although "the legal and regulatory framework is shifting" in Aereo's favor, "the timing of a decision from the FCC is uncertain." Faced with "mounting legal costs," he said, the company filed for Chapter 11 to aid in "consummating a sale of substantially all of its assets, recapitalizing or entering into some other reorganization transaction for the benefit of its creditors and shareholders."

Those assets consist primarily of its cash on hand, its equipment and technology, its intellectual-property portfolio and its business potential, Mr. Rivera said.

Keach Hagey contributed to this article.

Write to Patrick Fitzgerald at patrick.fitzgerald@wsj.com

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