According to many of the world’s leading anti-piracy groups, site blocking is one of the most effective tools when it comes to reducing instances of online piracy. It’s a technique employed in a growing list of countries around the world, in Europe in particular.

After pioneering work seven years ago (Denmark was one of the first countries to block The Pirate Bay back in 2008), subsequent action by anti-piracy group Rettigheds Alliancen (Rights Alliance) ended in a 2011 ISP blockade of now-defunct music streaming service Grooveshark.

Earlier this year the anti-piracy group took fresh action that resulted in the blocking of 12 large sites including KickassTorrents, RARBG and streaming site Tubeplus. Now Rights Alliance is back again, with its biggest blocking effort yet.

After obtaining an order from the District Court in Frederiksberg yesterday, an additional 20 piracy sites will now be blocked at the ISP level.

Rights Alliance hasn’t yet revealed their names but speaking with TorrentFreak the anti-piracy group says that they’re the 20 most popular sites among local users and targeting them all at once has two distinct aims.

“By choosing 20 sites in one action it is really just adapting the means available to the internet and its ‘swarm activities’. Blocking one site at a time would make but a little disturbance, just redirecting the user request to other likewise illegal sites.” Rettigheds Alliancen CEO Maria Fredenslund informs TF.

“Swarm blocking provides a more massive intervention in the user flow, combined with positive communication nudging the…

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