Mountain Lion has just joined the club of the most popular felines in the world, and those of you who won't wait a single minute to install Mac OS X 10.8 will discover rather quickly one of the new features of the operating system called Gatekeeper.
Gatekeeper is designed to protect users from malicious downloads and by default blocks opening executables that haven't come from the Mac App Store or that aren't signed with a certificat formally identifying the developer via Apple.
