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Gatekeeper is a security feature of the OS X operating system by Apple. It allows users to restrict which sources they can install applications from, in order to reduce the likelihood of inadvertently executing malware. It was originally introduced for OS X Mountain Lion and version 10.7.5 of its predecessor Mac OS X Lion. Gatekeeper can also be activated on Lion as of version 10.7.3 via the command-line utility spctl. The feature builds upon File Quarantine, which was introduced in Mac OS X Leopard. ==Functions== Users have three options in the security & privacy panel of system preferences: * Mac App Store: allows only applications downloaded from the Mac App Store to be launched. * Mac App Store and identified developers: Allows applications downloaded from the Mac App Store and applications signed by certified Apple developers to be launched. This is the default setting in Mountain Lion and later. * Anywhere: allows all applications to be launched. This is the default setting in Lion. When the system attempts to open an application that does not meet the chosen option's criteria, the system will refuse to open it and inform the user accordingly. To override Gatekeeper, the user either has to manually switch to a more lenient option (typically requiring an administrator password) or has to open the application from the context menu, although this only works when the second option is chosen. Once an application has passed Gatekeeper, it will be allowed to run normally and won't be verified again.〔 When Apple identifies an application as malware, it can add the application to the known-malware list and prevent Gatekeeper from accepting it. In addition, Apple can revoke the developer's certificate and prevent the developer from spreading other malicious programs. Applications that are already installed by the user will not be affected.〔 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「Gatekeeper (OS X)」の詳細全文を読む スポンサード リンク
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