TL;DR:If you have an app from an unidentified developer and you're sure the app is safe, you can force it to run by right clicking (or command-clicking) the app and choosing 'Open' from the context menu.OS X's Gatekeeper feature —introduced with OS X Mountain Lion —places restrictions on which apps can be run on a Mac based on the avenue through which the apps were acquired. There are three tiers: apps which are distributed by registered developers through the Mac App Store, apps which are distributed by registered developers outside of the Mac App Store, and apps which are not made by registered developers.Gatekeeper distinguishes between the latter two based, broadly, on whether the app has been signed with a legitimate Apple-issued signing key.By default, Gatekeeper is configured to allow apps from the Mac App Store and from registered developers. Wise registry cleaner 7 serial key.