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Skip Gatekeeper once System 10.8
By default Gatekeeper allows you to run apps from the Mac App Store and from verified developers. You can change this setting in the Security preference pane. If you use this setting, or the Mac App Store only setting, you can still run unsigned apps. Just Control- or right-click on an app and choose Open. Gatekeeper will display a dialog asking if you're sure you want to open the application.

[kirkmc adds: There is an extensive article on Macworld about Gatekeeper, but I felt this would be good to mention as a hint. I think most readers of this site won't use the restrictive settings, but you may work with others who do, or administer computers, and may want to launch unapproved apps on those computers from time to time.]
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Skip Gatekeeper once | 2 comments | Create New Account
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Skip Gatekeeper once
Authored by: idontwanttoregis on Jul 31, '12 08:30:10AM

It may be a good point to mention a fact that a lot of people seem to overlook when talking about Gatekeeper.

The Gatekeeper functionality only affects files that have been downloaded over the internet and not applications that have been transferred e.g. via a USB drive. More specifically it only affects applications and packages that have the "" flag set on them.
You can check for this flag by running "xattr <filename>" in the Terminal.

So if you download some file through an application that does not set this flag (or you remove the flag manually with e.g. "xattr"), Gatekeeper will not check the signature.

Just wanted to mention this since a lot of people seem to have problems understanding what Gatekeeper is exactly and what it really does.

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Skip Gatekeeper once
Authored by: simsamsep on Jul 31, '12 01:02:54PM

Thanks for the explanation. As an addition: I noticed that the latest TinkerTool has (at least in Mountain Lion) a setting "Don't show quarantine warnings for downloaded files". I did not (yet) enable it.

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