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| Jailbreak (iPhone OS) ： ウィキペディア英語版 |
IOS jailbreaking
iOS jailbreaking is the process of removing software restrictions imposed by iOS, Apple's operating system, on devices running it through the use of software exploits; such devices include the iPhone, iPod touch, iPad, and second-generation Apple TV. Jailbreaking permits root access to the iOS file system and manager, allowing the download of additional applications, extensions, and themes that are unavailable through the official Apple App Store.
Jailbreaking is a form of privilege escalation, and the term has been used to describe privilege escalation on devices by other manufacturers as well. The name refers to breaking the device out of its "jail", which is a technical term used in Unix-style systems, for example in the term "FreeBSD jail". A jailbroken iPhone, iPod touch, or iPad running iOS can still use the App Store, iTunes, and other normal functions, such as making telephone calls.
Restoring a device with iTunes removes the jailbreak.
== Reasons for jailbreaking ==
One of the reasons for jailbreaking is to expand the feature set limited by Apple and its App Store. Apple checks apps for compliance with its iOS Developer Program License Agreement before accepting them for distribution in the App Store. However, their reasons for banning apps are not limited to safety and security and may be regarded as arbitrary and capricious.〔http://www.businessinsider.com/the-story-of-apples-confusing-inconsistent-rules-for-app-developers-2013-4〕 In one case, Apple mistakenly banned an app by a Pulitzer-Winning cartoonist because it violated its developer license agreement, which specifically bans apps that “contain content that ridicules public figures." To access banned apps,〔http://www.imore.com/tag/rejected-apps〕 users rely on jailbreaking to circumvent Apple's censorship of content and features. Jailbreaking permits the downloading of programs not approved by Apple,〔(FoxNews )〕 such as user interface customization, pornography, and religious apps. 〔http://www.huffingtonpost.com/2014/01/10/banned-religious-apps_n_4577642.html〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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