NHL cracks down on streaming apps during playoffs

A week into the National Hockey League playoffs, social media streaming has caused a stir.

The league on Tuesday warned news media to stop using apps like Periscope and Meerkat during or around games at the risk of violating broadcast rules, Yahoo Sports reported. Some credentialed media have live-streamed warm-ups or breaks in games to Twitter followers, which is what the two apps make possible, through a cell phone.

Andre Burakovsky of the Washington Capitals skates against the New York Islanders in Game Four of the Eastern Conference Quarterfinals at Nassau Coliseum on April 21, 2015 in Uniondale, New York.
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Andre Burakovsky of the Washington Capitals skates against the New York Islanders in Game Four of the Eastern Conference Quarterfinals at Nassau Coliseum on April 21, 2015 in Uniondale, New York.

In a memo issued Tuesday, NHL Deputy Commissioner Bill Daly said that live-streaming in an arena less than 30 minutes before a game was "expressly prohibited," according to Yahoo.

Read MoreWhat Meerkat, Periscope mean for sports broadcasts

Major American sports leagues hold lucrative and closely-guarded broadcast rights. Under its current television contract, the NHL takes in more than $600 million annually, according to Vanderbilt Sports Economics.

Read the full Yahoo report here