Important Change to Mac App Store Applications

Apple, Inc. made an e-mail announcement yesterday concerning Gatekeeper, a security Preferences pane, involving Mac App Store applications. The company intends to update the current version of Mac OS X Mavericks to 10.9.5 before releasing Yosemite. With the release of 10.9.5, the current code-signing signature will no longer be validated with Gatekeeper under Mavericks. The following is the exact message from Apple.

With the release of OS X Mavericks 10.9.5, the way that OS X recognizes signed apps will change. Signatures created with OS X Mountain Lion 10.8.5 or earlier (v1 signatures) will be obsoleted and Gatekeeper will no longer recognize them. Users may receive a Gatekeeper warning and will need to exempt your app to continue using it. To ensure your apps will run without warning on updated versions of OS X, they must be signed on OS X Mavericks 10.9 or later (v2 signatures).

The statement above is not clear as to what will happen to Mac App Store applications with a v2 code-signing signature under Mac OS X Mountain Lions or lower. Meanwhile, we will gradually update our Mac App Store applications accordingly. For now, please open System Preferences and set the radiobutton option of Security & Privacy Preferences Pane to Anywhere. Click here for more information on Gatekeeper.