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Always-on DRM or always-online DRM is a form of DRM that requires a consumer to remain connected to a server, especially through an internet connection, to use a particular product. The practice is also referred to as persistent online authentication. The technique is meant to prevent copyright infringement of software. Like other DRM methods, always-on DRM has proven controversial, mainly because it has failed to stop pirates from illegally using the product, while causing severe inconvenience to people who bought the game legally. ==Usage== Popular video games such as ''Diablo III'' and ''Starcraft 2'' employ always-on DRM by requiring players to connect to the internet to play, even in single-player mode. Reviews of ''Diablo III'' criticized its use of always-on DRM. As with ''Diablo III'', ''SimCity (2013)'' experienced bugs at its launch due to always-on DRM. Its developer, Maxis, initially defended the practice as being a result of the game's reliance on cloud computing for in-game processing, but it was later confirmed that cloud computing was only necessary to support the inter-city and social media mechanisms.〔(【引用サイトリンク】url=http://www.rockpapershotgun.com/2013/03/16/simcity-bosss-straight-answers-seem-pretty-wiggly/ )〕 Tim Willits at id Software has also defended the use of always-on DRM, arguing that it would make updates easier. Reviewers have expressed issues such as early review experiences with products that have always-on requirement is in no way representative of the final product, since reviewers did not play under the same circumstances as normal consumers.〔penny-arcade.com/report/editorial-article/why-you-shouldnt-trust-our-simcity-review〕 A major disadvantage of always-on DRM is that whenever the DRM authentication server goes down, or a region experiences an Internet outage, it effectively locks out people from playing the game, hence, the criticism. Ubisoft's first title requiring an always-on connection was ''Silent Hunter 5: Battle of the Atlantic'', which had reportedly been cracked as of the first day of the game's release.〔Geek.com. (Ubisoft’s always-connected games DRM already cracked ). Accessed 2013-03-12.〕 Ubisoft also used always-on DRM in ''Driver: San Francisco''. However, the company announced in September 2012 that it would not employ always-on DRM in its future games.〔 As of October 2015, always-online games with single player modes that now have had dead servers for six months and longer can now be cracked and copied under the DMCA. 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「Always-on DRM」の詳細全文を読む スポンサード リンク
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