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The Copyright Alert System (CAS) is a private system for alerting, educating, and punishing subscribers of five major Internet service providers in the United States of America, based on accusations of the use of BitTorrent and peer-to-peer file sharing to infringe the copyrights of certain entertainment corporations by distributing, without authorization, those companies' intellectual property. The press has branded the CAS as a "six strikes" program. The participating Internet service providers (ISPs) are AT&T, Cablevision, Time Warner Cable, Verizon and Comcast. The CAS is intended to be a graduated response system wherein participating ISPs send up to six〔Brimmeier, Khristyn. (Music, Film, TV, and Broadband Collaborate to Curb Online Content Theft ), RIAA, July 2011.〕 electronic warnings notifying subscribers of alleged copyright infringement, as reported by a monitoring service working on behalf of participating copyright owners.〔Bruno, Antony. (Labels Reach Deal With ISPs on Antipiracy Effort ), billboard.biz, July 07, 2011.〕 If copyright infringement is reported after a final warning, the ISPs have agreed to implement "mitigation measures", which can include penalties such as bandwidth throttling.〔 〕 The CAS framework was established on July 7, 2011 by the Center for Copyright Information (CCI), after 3 years in the making.〔 After multiple delays, ISPs began implementing it in late February 2013. ==Overview== The Center for Copyright Information employs the services of MarkMonitor (often doing business as DtecNet) to detect and monitor suspected copyright infringement activity.〔(【引用サイトリンク】title=U.S. Copyright Surveillance Machine About To Be Switched On, Promises of Transparency Already Broken )〕 Although MarkMonitor monitors many infringement venues, in early 2013 the Electronic Frontier Foundation (EFF) said it appears that for purposes of the CAS, the company will only monitor peer-to-peer traffic from public BitTorrent trackers.〔https://www.eff.org/deeplinks/2013/02/six-strikes-copyright-alert-system-faq〕 The Copyright Alert System does not use deep packet inspection.〔 A review of MarkMonitor's system for the CAS stated that only uploads are monitored, with infringement being suspected when MarkMonitor's BitTorrent client successfully obtains pieces of known-infringing content from a peer in the swarm.〔 The pieces are compared to pieces from an already-downloaded copy of the content, which has already been matched to content samples supplied by the copyright owners.〔 When suspected infringement is detected, the ISP for the IP address associated with the suspicious activity is notified. The ISP, in turn, notifies the subscriber to whom the IP address was assigned at the time of the alleged infringement, informing the subscriber that their account is suspected of being used to infringe copyright, and to warn of potential consequences. Users who continue to receive warnings may be issued up to six alerts in the form of pop-up messages and e-mails before stronger measures are taken by the ISP. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Copyright Alert System」の詳細全文を読む スポンサード リンク
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