Since new laws are requiring Internet Service Providers to keep data for one year, that this could be used against them also.
Already back in 2013 IPS's where orderd by courts to block "illegal content" websites. And recently additional websites have been added to the list.
But now as part of the UK government's attempt to crack down on piracy, BT, Virgin Media, TalkTalk and Sky have agreed to send those identified with a missive, which will be emailed rather than posted.
The controversial move has been years in secret planning, and some experts believe it is too late to be an effective deterrent.
The BBC have been shown a sample letter, which will be headed with the customer's telephone number.
It reads: "Get It Right from a Genuine Site' has got in touch with us.
"Get it Right is a government-backed campaign acting for copyright owners who think their content's been shared without their permission.
"It looks like someone has been using your broadband to share copyrighted material (that means things like music, films, sport or books).
"And as your broadband provider, we have to let you know when this happens."
It then provides a list of the content in question and directs users to a website with "tips and advice on how to stop it happening again".
Preliminary data indicates that the heralded comeback of Kickass torrents may not be as huge as many observers initially expected. Since KAT's return in December, top torrent websites Pirate Bay, ExtraTorrent, Rarbg, Torrentz2, and 1337x have all seen increases in traffic or held basically steady despite competition from the former number 1 torrent website.
This follows recent news about KODI devices enabled to download new copyrighted material from Sports and movie channels.
One pub owner was fined £8000 for using one to show unlicensed sports broadcasts.
Currently in the courts a case where the outcome will determine that those boxes will be illegal and a heavy sentence.
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