Gatekeeper knows about three different types of apps: Related: How to Install Applications On a Mac: Everything You Need to Know (You may also want to bypass this and run an unsigned app if you're developing your own apps.) That's why Apple offers a way to bypass Gatekeeper. Maybe they haven't been updated in a while, or maybe the developer just didn't bother. Some apps available on the web-particularly older ones-just aren't signed, even if they're trustworthy. If it's not, you'll see a warning message and your Mac will prevent the application from running.īut not every Mac app is signed. If the application is signed with a valid signature, it's allowed to run. Whenever you launch a new application on your Mac, Gatekeeper checks to see that it's signed with a valid signature. Old versions let you turn it off with a simple switch, while macOS Sierra makes things a little more complicated. Gatekeeper works a little differently depending on which version of macOS you're running.
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