To change these settings, your user account must have Administrator privileges. The app cannot be installed, unless the user specifically permits it in system preferences ( see below). If a signature is found and verified by Gatekeeper, the installation may continue, if permitted in system preferences ( see below). All software in the App Store undergoes a code review by Apple engineers and is given a cryptographic digital signature that is verified by Gatekeeper. When you attempt to install a downloaded application, Gatekeeper behaves in one of three ways: Software installed from other sources, including network drives and removable media, are not checked by Gatekeeper.
Gatekeeper security applies only to applications downloaded from the Internet. Gatekeeper System Administration tools.
