It's been over a year since security software giant Avast purchased rival AVG Technologies for $1.3 billion, bringing its total user numbers to around 400 million. Now, the Czech company has acquired ...

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Avast, today's largest vendor of security software, has acquired Piriform, a UK-based company that is behind many successful desktop and mobile apps, such as CCleaner, Recuva, Speccy, and Defraggler.

Security software giant Avast has acquired Piriform, the U.K.-based company behind CCleaner -- one of the most popular system cleaners on desktop and mobile. Founded out of London in 2004, Piriform is ...