The warning messages displayed below are examples, and it's possible that you could see a similar message that isn't displayed here. Please use caution if you choose to install any software for which your Mac displays an alert. By default, the security and privacy preferences of your Mac are set to allow apps from the App Store and identified developers. For additional security, you can chose to allow only apps from the App Store. Click the lock and enter your password to make changes.
An app that has been notarized by Apple indicates that Apple checked it for malicious software and none was detected. 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.
If you see this warning, it means that the app was not notarized, and Apple could not scan the app for known malicious software. You may want to look for an updated version of the app in the App Store or look for an alternative app. If macOS detects that software has malicious content or its authorization has been revoked for any reason, your Mac will notify you that the app will damage your computer.
You should move this app to the Trash and check "Report malware to Apple to protect other users. If you still want to open an app for which the developer cannot be verified, open System Preferences.
Click the Open Anyway button in the General pane to confirm your intent to open or install the app. The warning prompt reappears, and if you're absolutely sure you want to open the app anyway, you can click Open.
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. We have never combined data from these checks with information about Apple users or their devices. We do not use data from these checks to learn what individual users are launching or running on their devices.
Notarization checks if the app contains known malware using an encrypted connection that is resilient to server failures.
To further protect privacy, we have stopped logging IP addresses associated with Developer ID certificate checks, and we will ensure that any collected IP addresses are removed from logs.
Gatekeeper also protects against the distribution of malicious plug-ins with benign apps. When necessary, Gatekeeper opens apps from randomized, read-only locations. This is designed to prevent the automatic loading of plug-ins distributed alongside the app. All apps from the App Store are sandboxed to restrict access to data stored by other apps. If an app from the App Store needs to access data from another app, it can do so only by using the APIs and services provided by macOS.
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