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    OS X GateKeeper

    Starting with Mac OS X 10.8, Apple introduced a new feature called GateKeeper. GateKeeper's goal is to provide security to OS X users. 

    In short, if a program is not signed by a security certificate (provided by Apple), then under the default configuration (most users), OS X will not allow the app to run.

    If you try to run a Mac application that is not signed, GateKeeper will display the following message:

    Getting around this restriction is easy, but many Mac users don't know how.

    In your instructions, tell your users that if they receive this message, they simply need to right-click (or control-click) the app and choose "Open".

    You can, however, digitally sign your Macify app and avoid this whole issue altogether.