Police have created an online database of websites "verified" as being illegal.
It is hoped that firms that handle advertising will use the resource to make sure they do not serve advertising on those sites, cutting off revenue.
Top piracy sites generate millions of pounds thanks to advertising.
One estimate, from the Digital Citizens Alliance - a group backed by rights holders - suggested that piracy websites worldwide generated $227m (£137m) from advertising revenue each year.
if you can't beat them, you can at least starve them