Apple's latest operating system release, OS X Mountain Lion, introduces several new security features, many of which are tied to purchases and downloads from the Mac App Store. In this Short Cut, we cover new security technologies such as Gatekeeper, the App Sandbox, runtime protection, the Password Assistant, and the Privacy Controls preference pane. We also explain security-related enhancements to OS X, including Safari anti-phishing, parental controls, Find my iPhone, Downloaded file alerts, and FileVault 2.