similar “Gatekeeper” feature http://www.apple.com/macos/security/ page about macOS Security locked-down App Store locked-down App Store MacOS Security protect data on Mac Apple security page Apple’s webpage macOS macOS protect data on Mac MacOS MacOS MacOS - Security Apple builds in protective features in this page of the Apple site page about macOS Security OS X Mountain Lion Security Features MacOS MacOS apple.com Apple’s built-in protections https://www.apple.com/macos/security/ locked-down App Store MacOS - Security more secure and reliable Safety. Built right in. https://www.apple.com/macos/security/ Mac OS Security sandboxed Mac OS Security