The Copyright Alert System (CAS) was created by the Center for Copyright Information (CCI) and five of the biggest Internet Service Providers. Two CCI ISPs, Verizon and Comcast, activated the service on Wednesday. The alerts get sent out generally after four copyright offenses, at which time the following so-called Mitigation Measures might kick in: temporary reductions of internet speeds, redirecting to a landing page until the subscriber contacts the ISP to discuss the matter or responds to some educational information about copyright.”]
Source: https://nakedsecurity.sophos.com/2013/03/04/us-isps-pirate-campaign/