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From: https://support.apple.com/en-us/HT205267
Finder
Available for: Mac OS X v10.6.8 and later
Impact: The "Secure Empty Trash" feature may not securely delete files placed in the Trash
Description: An issue existed in guaranteeing secure deletion of Trash files on some systems, such as those with flash storage. This issue was addressed by removing the "Secure Empty Trash" option.
CVE-ID
CVE-2015-5901 : Apple