If you download copyrighted material, your ISP might start scolding you by sending you emails, redirecting file sharing websites to education ones and even reduce your download speeds for days at a time. But that seems to be the extent of what will happen. No personal information is to be sent to copyright holders which would mean no lawsuits for sharing copyright material should ever happen.
Source: http://www.theverge.com/2013/2/25/4026194/infamous-six-strike-anti-piracy-program-barks-harder-than-it-bites
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