The US system of alerting consumers trading in unauthorised copyrighted content has gone into effect. ISPs will now warn customers when illegal filesharing is detecte.
The Copyright Alert System (CAS) was devised by a coalition of Internet Service Providers, content owners and the government to curb illegal downloading by alerting "casual infringers" when illegal file-sharing is detected on their IP address.
According to the Executive Director of CAS, Jill Lesser, "Implementation marks the culmination of many months of work on this groundbreaking and collaborative effort to curb online piracy and promote the lawful use of digital music, movies and TV shows."
More information on the system can be found here: http://www.copyrightinformation.org/the-copyright-alert-system/