Search giant Google quietly bought up GreenBorder Technologies earlier this month in an acquisition that some company watchers have speculated signals a future security offering.

The deal, which reportedly closed earlier in May, gives Google access to GreenBorder’s virtualization technology, which allows Internet browsers to run in a sandboxed environment to prevent malicious code from interacting with a user’s PC. The only notice of the deal appeared to be a statement on GreenBorder’s support site.