Mac OS X 10.8 Mountain Lion comes pre-loaded with software called ‘Gatekeeper’, which is designed to help keep malicious software off of your Mac by giving you more control over what you install. How it works is quite simple – Gatekeeper will either allow you to run:
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Some applications are not signed by Apple and will not be able to be installed. If you trust the application and know you want to install it, follow these steps to allow third party apps to install. Open 'System Preferences' by clicking on the Apple icon and choosing that option.
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Now, apps started through Terminal are also checked. These files get the same malware scan, signature check, and local security policy check. The difference: even on the first run, you only need to explicitly approve software launched in bundles, like a standard Mac app bundle, not for standalone executables or libraries. Your application will start in the usual way. Following this path, you can open all applications created by unidentified developers, however, bear in mind that you will also be increasing the chance of Mac infection. Back to Table of Contents Allow access to all applications created by an unidentified developer.
- Only applications downloaded from the Mac App Store
- Applications downloaded from the Mac App Store and from identified developers
- Any downloaded application.
These options can be found in System Preferences > Security & Privacy > ‘General’ Tab How to correct app architecture on a mac.
By default, Gatekeeper is set to ‘Mac App Store and identified developers.’ This means that a Mac running Mountain Lion will only run applications you have downloaded from the App Store or applications that have been signed with an official Apple Developer ID. This helps to prevent malware from infecting your computer, as it makes it harder for malicious software posing as real applications to be installed by the user.
Note that Gatekeeper only applies to applications downloaded from the internet – any applications already on your computer or transferred to your computer in another way (i.e. USB, etc.) will not be stopped by Gatekeeper, so be cautious in this regard.
Bypassing Gatekeeper
If you need to install a downloaded piece of software that isn’t signed by an official Apple developer, Gatekeeper will, by default, not allow you to run it. However, there are several simple ways to bypass this security feature and install the application. Note: these methods may require administrative privileges.
- The simplest and easiest way is to control-click (or right-click) the downloaded app to run/install, and on the revealed context menu, choose ‘Open.’ On the ensuing dialogue box, choose ‘Open’ as well. Note that this will exempt this file from Gatekeeper, so, if needed, it can be run again by double-clicking. This is the recommended method.
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Choose ‘Anywhere’ on the Gatekeeper settings. This will allow you to run any downloaded piece of software (but will still warn you that you are opening a potentially unsafe program).
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Note that if you choose to set Gatekeeper to ‘Anywhere’, you may at any time change this back to a stricter and thus safer setting. So, you can use the ‘Anywhere’ setting to install needed software (that is unverified by Apple), and change it back to ‘Mac App Store and identified developers’ when finished.
Remember, when installing any piece of software, make sure you know exactly what it is and where it came from. Gatekeeper is NOT an anti-virus program. If you bypass Gatekeeper on a malicious download, it will infect your computer. So, always exercise caution when running any new application.
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Delete photo app from mac. Revert the setting back to “Mac Apple store and identified developers” when you have finished, Just to be on the safe side, Re-lock padlock and your done.