Many 3rd party apps that I have used before now will not open with the alert "XYZ application cannot be opened because the identity of the developer cannot be confirmed"  Why now?

Many 3rd party apps that I have used before now will not open with the alert "XYZ application cannot be opened because the identity of the developer cannot be confirmed"  Why now since I updated Mavericks?

The format in which a developer has to sign his application in order for it to be recognized as signed has changed. Update the applications, wherever possible.
To make a one-time exception to the security policy, follow these instructions. They apply to Installer packages and other installable items as well as applications.

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    <Post edited by Host>

    Do not call the number.
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