For additional security, you can chose to allow only apps from the App Store.
How to Allow Apps from Anywhere in Gatekeeper for macOS Mojave, MacOS Sierra
Click the lock and enter your password to make changes. Prior to macOS Catalina, opening an app that hasn't been notarized shows a yellow warning icon and asks if you're sure you want to open it:. If you have set your Mac to allow apps only from the App Store and you try to install an app from elsewhere, your Mac will say that the app can't be opened because it was not downloaded from the App Store.
You may want to look for an updated version of the app in the App Store or look for an alternative app. Click Open Anyway to confirm your intent to open or install the app. The app is now saved as an exception to your security settings, and you can open it in the future by double-clicking it, just as you can any authorized app. Enter your admin name and password to open the app.
What Gatekeeper in OS X 10.8 means for Mac security
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When you turn on Gatekeeper in OS X There are two security settings for Gatekeeper: to allow only programs downloaded from the Mac App Store to run on the system, or to extend this trust to signed applications created by developers in Apple's developer program. In a way this approach is very similar to Apple's KidSafe parental controls feature in its iTools services Apple's predecessor to.
Mac, MobileMe, and iCloud back in , in which the company maintained a library of approved Web sites that were allowed to be viewed on a system. Unfortunately the vastness and complexity of the Web crushed the feasibility of this venture, but Apple's tightly controlled developer program and App Store distribution service make this type of approach more practical when it comes to programs. Apple can take advantage of the Mac App Store's popularity to block out any harmful material, should you wish to subscribe to it.
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Even with this new technology and Apple's efforts to get developers to join its developer program, there are many useful and legitimate programs for OS X that do not subscribe to Apple's developer program and are distributed on developer Web sites instead of through the Mac App Store. Luckily, in Mountain Lion you can allow these programs to run by right-clicking them and installing them despite your chosen level of Gatekeeper security, or by disabling Gatekeeper altogether; however, you will need to be a little more aware of the programs you install on your system.
A final point about Gatekeeper is it works by using the quarantine extended attribute that the system tags to files when they are downloaded.
Mountain Lion: Hands on with Gatekeeper | Macworld
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