GuardianEdge was a spin-off of security-software provider PC Guardian. Its software helps with endpoint data protection on laptops, desktops, smartphones and so on. The Rationale Taken together, PGP and GuardianEdge are a powerful combination. With the acquisitions, Symantec will get a comprehensive suite of encryption technologies as well as a massive installed base, and a stronger footprint in the federal government. The PGP and GuardianEdge assets will also help Symantec adapt to the rapidly growing trends of cloud computing and virtualization, both of which increase the risks of data exposure and will require robust encryption solutions. Based on estimates, the valuations of these deals come to roughly four times trailing earnings -- reasonable in light of the potential growth opportunities. In the short run, though, there will be a drag: Earnings dilution is expected at 2 cents per share for fiscal year 2011 on a non-GAAP basis.