The MPAA and RIAA, helped by five major Internet providers in the United States, will start to warn and punish copyright infringers later this year. The parties launched the Center for Copyright Information (CCI) and agreed on a system through which copyright infringers are warned that their behavior is unacceptable. After five or six warnings ISPs may then take a variety of repressive measures. Initially the first ISPs were expected to send out the first copyright alerts by the end of 2011, but for reasons unknown this deadline silently passed, as did the revised July 2012 start date. TorrentFreak learned that all Internet providers now plan to roll the scheme out whenever they see fit, but still no official explanation has been given for the apparent delay.

Excerpt from: 
Efficiency Tests Delay U.S. “Six Strikes” Anti-Piracy Scheme