The Copyright Alert System (CAS) is a private system for alerting and punishing internet subscribing customers of AT&T, Cablevision, Time Warner, Verizon and Comcast in regards to accusations of bit torrent use via their home networks to access alleged copyrighted material from a list of specific entertainment corporations and their CAS registered content. It is limited to customers of those internet vendors in the United States. The consortium that manages the program has branded it as the "six strikes program."
It is intended to be a graduated response system wherein participating ISPs send up to six electronic warnings notifying subscribers of alleged copyright infringement, as reported by a monitoring service working on behalf of participating copyright owners. The first two notices are "educational" notices, which inform subscribers of the alleged infringement, remind them of copyright rules and encourage them to seek content through legitimate sources. The third and fourth notices are "acknowledgment" notices which, in addition to the education notice, require acknowledgment from the subscriber, for example, by clicking on a pop-up notice. The final two notices advise that a "mitigation measure" will be applied.
If copyright infringement is reported after a final warning, the ISPs have agreed to implement "mitigation measures," which may include, for example, bandwidth throttling, or redirection to a landing page until the subscriber contacts the ISP.
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