Mac Mavericks App can't be Opened because it is from an unidentified developer Solution

Solve Mac Mavericks App from Unidentified Developer

The Tip Show How-to Solve "App can't be Opened because it is from an unidentified developer" on Mac Mavericks 10.9 OS X.

To Enable Unsigned Apps Installation You Need Simply to Disable the Gatekeeper on Mac Mavericks.

That's because Now Apple Require to Participate to the Developer Program and App Store Shoppingc to Make Securer and Easier the Business :)

1. Open System Preferences
   
2. Select Security & Privacy
   
3. Disable Gatekeeper