A deal between entertainment industry bodies and major UK Internet service providers to target downloading is "imminent", according to the BBC.
BT, Sky, Talk Talk and Virgin Media will send letters to alleged "pirates", in a version of plans set out in the controversial and unpopular Digital Economy Act.
The Digital Economy Act was passed at the very end of the Labour government in 2010, but has since stalled.
Copyright enforcement groups have agreed to pay towards the system, but ISPs will still have to foot the remainder of the bill.
Pirate Party Leader Loz Kaye said:
"The entertainment industry has been unable to get its own way democratically, so it is now planning to get the Digital Economy Act through by the back door. The Tory / LibDem coalition has shown itself to be useless on the issue of digital rights.
Internet users will come to pay for the privilege of being spied on.
Plans for spam letters will do nothing to help artists. This is clearly a gateway to more draconian crackdowns. Copyright enforcement groups are asking for rapid implementation of 'stronger measures' after a review. The industry must come clean on what these 'stronger measures' are. Will entire families be chucked off the Internet, meaning they can't access services like Universal Credit?
Yet again we have been denied a democratic choice over digital rights. Thankfully, we have one on May 22nd. People who care about this issue should take the opportunity to vote Pirate Party if you have that choice on the ballot."