The boxing promoter Duco says it will prosecute people who illegally streamed the boxing match between Joseph Parker and Alexander Dimitrenko.
Improved cooperation with Facebook allowed the promoter and Sky TV to quickly identify and remove many illegal streams of last night's match.
Duco chief executive Martin Sneddon said between 40 and 50 live streams were pulled down over the course of the match on Saturday night, which Parker won by technical knock out in the fourth round.
Duco and Sky had the means and the evidence to prosecute illegal streamers - and would follow through, Mr Sneddon said.
"We now have, with Sky TV, a pretty significant anti-piracy team that operates on event nights for us.
"We're out to find people who are stealing our property, and we're going to take action against them."
Sky TV and Duco made similar legal threats against live streams of Parker's fight against Carlos Takam in May.
Then, intellectual property expert Clive Elliot said when it came to streaming the law was unclear.