The Copyright Alert System (CAS), more commonly referred to by its ‘six strikes’ moniker, began operation in late February in the US. Under the CAS, internet subscribers whose accounts are used illegally to share copyright material may receive one or more alerts from their internet service provider (ISP). If the subscriber receives five or six alerts (a.k.a strikes), their account may be subject to the application of a ‘mitigation measure’ such as temporarily slowing down the connection speed.