If you're using a VPN service or a VPN connection to your company when working on an open hotspot network, securing search isn't terribly important. And securing search alone isn't enough; a secured proxy Web server that lets you redirect all queries would be better.
However, for those without the resources to use a VPN (or pay for a service like Anonymizer) could turn to Google for at least a bit of protection.
And if you live under a regime in which searches are dangerous, a secured search--if not blocked--is a conduit to freed information.
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