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Is this what you are referencing, Stewart? Looks like an extension for Chrome using open source PGP
Google Online Security Blog: Making end-to-end encryption easier to use
No, it's on this page, the 4th item down:
https://www.google.com/work/apps/business/learn-more/security.html
It comes integrated with your Google Apps suite, you just have to specify it to be turned on.