By Yoree Koh And Joe Flint 

Technology is once again challenging the business models of old media, this time in the space of a tweet.

Just two months after its debut, Twitter Inc.'s recently acquired Periscope app, along with rival Meerkat, are rankling television networks, Hollywood studios and television distributors by giving users the ability to shoot live video with their smartphones and instantly broadcast it to thousands of viewers.

That power was on display during the so-called Fight of the Century between Floyd Mayweather Jr. and Manny Pacquiao on Saturday night, when Twitter lit up with tweets from Periscope and Meerkat users linking to live-video feeds of the boxing match. Unlike an estimated three million people who paid HBO or Showtime $100 for a high-definition TV feed, thousands of others preferred to open the apps and watch the free shaky, grainy footage shot by amateurs pointing their smartphones at their TV sets.

The rush of attention to the app prompted Twitter Chief Executive Dick Costolo to declare in a tweet that Periscope was the clear winner. But, as in the case with many fights, even the victor takes some hits.

Periscope's weak spot was piracy. A spokeswoman said it received 66 take-down requests from copyrights holders and shut down 30 of them within minutes. It didn't act on 36 streams because they had already ended. That highlights the unique challenges of dealing with the brief life of real-time video streams.

In a statement, Periscope said it respects intellectual-property rights and is "working to ensure there are robust tools in place to respond expeditiously." The company declined to elaborate.

Meerkat CEO Ben Rubin said his app received less than 100 take-down requests from rights holders, which Meerkat employees then reviewed and removed accordingly.

The championship bout marked the latest salvo in the piracy wars between tech companies, which are cultivating ways for people to share content, and media giants, who are trying to protect their programming.

The situation is reminiscent of YouTube's seven-year legal battle with Viacom Inc., during which the media company alleged that the Google-owned video-sharing site infringed on its copyrights by allowing users to post nearly 160,000 unauthorized clips of Viacom programming.

YouTube claimed it qualified for protection from liability because it removed clips from its site when the copyright holder asked, per a clause in the Digital Millennium Copyright Act of 1998 that sought to shield intermediaries like Web-hosting services and access providers. Twitter's Periscope also invokes this clause as protection.

Google and Viacom settled the suit last year. Along the way, Google developed its Content ID system, which detects copyrighted works on YouTube and allows media companies to decide if they want them removed.

Google seriously considered building out its own desktop live-streaming service, which requires users to get Google's approval prior to live-streaming an event, into a less restrictive mobile app, said a former YouTube employee with knowledge of the matter. But for a variety of reasons the company didn't pursue it. Among them was that building the Content ID system while also fighting Viacom was such an undertaking that going into mobile live streaming didn't seem worth the extra investment, this person said.

Live video has been streamed on the Web for well over a decade, but the new apps are letting people use their smartphone to record anything around them while instantly building an audience through social media. That immediacy requires the live-streaming apps to be able to do damage control in real-time. Building such a tool takes time and resources.

Ustream, one of the more established live-streaming platforms, says it has created tools to combat piracy. These include a log-in function that allows media partners to go into the system and remove streams of copyright-infringing material and a fingerprinting technology that can compare the "DNA" of different streams. Such tools allow Ustream to delete pirated material within roughly 10 seconds, according to Ustream CEO Brad Hunstable.

The marketing power of live-streaming services isn't lost on Hollywood, which has seized on the moment not only to promote its stars and exclusive broadcasts, as HBO did by live streaming on Periscope from Mr. Pacquiao's dressing room before the fight, but also to battle pirated content.

Last month, HBO, a Time Warner Inc. unit, sent take-down notices to Periscope after users of the app broadcast episodes of its hit "Game of Thrones." At the time, HBO said app developers should have tools in place to prevent mass copyright infringement.

Neither HBO or CBS Corp.'s Showtime would comment on illegal streaming of the fight. Prior to the bout, the networks and promoters were granted temporary restraining orders against websites advertising streams to watch the fight. HBO and Showtime also contacted live-streaming platforms prior to Saturday's fight to alert them to the potential copyright-infringement issues.

Because Periscope and other newer live-streaming services don't have as sophisticated a system to determine when pirated material is being posted as YouTube does, HBO and Showtime were constantly filing requests to have streams of the fight removed, a person at one of the networks said.

One promoter, Top Rank Inc., which handles promotions for Mr. Pacquiao, said it is considering its legal options against people who streamed the fight and possibly the owners of the platforms.

"We are always concerned by piracy and will do what we can to assist the authorities and our programming partners to stop unlawful behavior," said Michael Berman, executive vice president and general counsel of iN Demand, which handles pay-per-view events for cable operators including Time Warner and Comcast Corp.

Write to Yoree Koh at yoree.koh@wsj.com and Joe Flint at joe.flint@wsj.com

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