By default, applications and Installer packages downloaded from the network will only run if they're digitally signed by a developer with a certificate issued by Apple. Starting with OS X 10.7.5, there has been a second layer of built-in malware protection, designated "
Security updates to the code of obsolete systems will stop being released at some point, and that may leave them open to other kinds of attack besides malware.ģ. The security of obsolete system versions may eventually be degraded.
As new versions of OS X are released, it's not clear whether Apple will indefinitely continue to maintain the XProtect database of older versions such as 10.6.
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