Changes to the Gatekeeper feature in OS X Mavericks designed to help protect users from malware and may be the result of a security breach Apple experienced through its Developer Portal. Developers first saw the change in the beta version of OS X 10.9.5, and if they haven't updated the digital signatures in their apps, end users will start seeing warnings saying those apps may not be trustworthy.
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Protecting users and developers from security risks is a hard job, and it isn't any secret that Apple's Developer Portal fell victim to attackers. It's possible the information the attackers made off with forced the company to change how Gatekeeper works to prevent similar attacks in the future.