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Valve Anti-Cheat, abbreviated as VAC, is an anti-cheat software developed by Valve Corporation as a component of the Steam platform, first released with ''Counter-Strike'' in 2002. During one week of November 2006, the system detected over 10,000 cheating attempts.〔 As of July 2014, it is estimated that over 2.2 million Steam accounts have been banned by the system. When the software detects a cheat on a player's system, it will ban them in the future, possibly days or weeks after the original detection.〔 It may kick players from the game if it detects errors in their system's memory or hardware. No information such as date of detection or type of cheat detected is disclosed to the player. After the player is notified, access to online "VAC protected" servers of the game the player cheated in is permanently revoked and additional restrictions are applied to the player's Steam account. ==History== In 2001, Even Balance Inc, the developers of the anti-cheat software PunkBuster designed for Counter-Strike and Half-Life mod stopped supporting the games as they had no support from Valve. Valve had also rejected business offers of integrating the technology directly into their games. Valve started working on a 'long-term solution' for cheating in 2001. VAC was first released with ''Counter-Strike'' in 2002, during its initial release, it only banned players for 24 hours. The duration of the ban was increased over time, players were banned for 1 year and 5 years, until 2005 with the release of VAC2, any new bans became permanent. VAC2 was announced in February 2005, and began beta testing the following month. On November 17, 2006 they announced that "new () technology" had caught "over 10,000" cheating attempts in the preceding week alone. During the early testing phase in 2002, some information was revealed about the program via the Half-Life Dedicated Server mailing lists. It can detect versions of "OGC's OpenGl Hack", OpenGL cheats, and also detects CD key changers as cheats. Information on detected cheaters is sent to the ban list server on IP address 205.158.143.67 on port 27013, which was later changed to 27011. There is also a 'master ban list' server. RAM/hardware errors detected by VAC may kick the player from the server, but not ban them.〔(【引用サイトリンク】archiveurl=http://web.archive.org/web/20030619231322/http://csnation.counter-strike.net/ )〕 Eric Smith and Nick Shaffner〔(【引用サイトリンク】archiveurl=http://web.archive.org/web/20031118144851/http://csnation.counter-strike.net/ )〕 were the original contacts for game administrators. In February 2010, the VAC Team consisted of Steam's lead engineer John Cook and his team of 16 engineers. In July 2010, several players who successfully used information leaked from Valve to increase their chances of finding a rare ''Team Fortress 2'' weapon/tool called the Golden Wrench found themselves banned by VAC.〔(【引用サイトリンク】title=TF2 Engineer Update Gets Serious – VAC Bans Issued )〕〔(【引用サイトリンク】title=Golden Wrench Scandal – Team Fortress 2 Golden Wrench Stolen )〕 As of July 2014, unofficial sources estimate that over 2.1 million Steam accounts have been banned by VAC.〔〔 In February 2014, rumors spread that the system was monitoring websites users had visited by accessing their DNS cache. Gabe Newell responded via Reddit, clarifying that the purpose of the check was to act as a secondary counter-measure to detect kernel level cheats, and that it affected one tenth of one percent of clients checked which resulted in 570 bans.〔(【引用サイトリンク】title=Valve, VAC, and trust )〕 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「Valve Anti-Cheat」の詳細全文を読む スポンサード リンク
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