We’ve all heard about antivirus software and firewalls. But we probably don’t know as much about the third leg of computer protection: a VPN, or virtual private network. In his latest article, company CEO Kent Lawson says we do this at our peril, because the damage we can suffer from not using a VPN may far outweigh the risks of the other two combined. After the large-scale hack attacks over the past few months at companies like Sony and Citibank, VPNs are now earning their spot as the third security leg that is vital to every-day computer security.