The Czech security firm Avast, which provides popular consumer antivirus software, has taken an investment from European private equity outfit CVC. The amount has not been disclosed, but Avast says it puts a billion-dollar valuation on the company (perhaps it’s preparing to shop itself around). The company says it will use the cash to beef up its mobile security products and push further into the U.S. and Asian markets in particular. Globally speaking, Avast’s 200 million users give it an antivirus market share just above 15 percent, putting it in second place behind Microsoft.

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