Jump to navigation Jump to search Not to be confused with the third-party extension Gatekeeper for “classic” Mac OS. Gatekeeper is a security feature of the macOS operating system by Apple. Mac App Store Allows only applications downloaded from the Mac App Store to be launched. Snow Leopard, the system keeps two blacklists to identify known malware or insecure software.
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If the application is blacklisted, then File Quarantine will refuse to open it and recommend to the user to move it to trash.