On Monday, Apple sent an email to Mac Developers encouraging developers to get ready for the launch of Developer ID and Gatekeeper, new security features that will arrive with Apple’s new operating system, OS X Mountain Lion, this summer.

“The Mac App Store is the safest place for our users to get software for their Mac, but we also want to protect users when they get applications from other places,” Apple wrote in the email.

“Gatekeeper is a new feature in OS X Mountain Lion that helps protect users from downloading and installing malicious software,” the email continues. “Signing your applications, plug-ins, and installer packages with a Developer ID certificate lets Gatekeeper verify that they are not known malware and have not been tampered with.”

Apple informs developers that if they are a member of the Mac Developer Program, they can start signing their applications with their Developer ID now in order to get ready for Gatekeeper when it arrives alongside Mountain Lion later this year.

When Apple first announced Gatekeeper, developers were unsurprised but cautious about the new security measures. Developers worry that Apple is heading towards a future in which Mac owners will be unable to run any software that isn’t purchased through the Mac App Store.

Recently, Mac security has been in the spotlight, following a Flashback Trojan that infected more than 600,000 Macs. The Flashback Trojan is considered to be the largest Mac malware threat to date.

Apple is expected to launch Mountain in June, at its Worldwide Developers Conference in San Francisco.