American Internet service providers (ISP) are set to really crack down on BitTorrent based piracy this summer as part of an agreement with copyright holders.
While there have been years of disagreement between both parties, ISPs claiming that it wasn't their job to police what their users did, last June an agreement was made between the biggest of them and content lobby groups like the Motion Picture Association of America (MPAA) and the Recording Industry Association of America (RIAA). This represented ISPs rolling over to some extent, promising to begin the sending out of warning letters to those thought to be pirating content by the end of the year. That date has come and gone, with July this year being the newly quoted cut off period for torrent file sharing as it's currently known.
Organisations like those above will be monitoring BitTorrent traffic and giving hints to ISPs like Comcast, Verizon and Time Warner Cable about those that they feel could be infringing. Those same companies will then issue letters to those thought to be responsible - most likely with IP address tracking - with slowly escalating warnings.
There will be several that merely attempt to "educate" the user, accoring to TorrentFreak, which if ignored will see notifications of a harsher nature. Laughably these will require an acknowledgment from the customer that indeed they are pirating in which instance if again ignored, the ISP is able to take measures to mitigate the account - perhaps throttling download speed. It can go as far as account suspension, but it seems very unlikely an ISP would willfully take that sort of step.