Linux as its known to be virus free but can we guaranty that its fully secured. I believe the threat to a Linux machine is not necessarily external threat but more of internal threat (user). How often do we scan our USB devices for viruses? Maybe never for most of us. This post is focused on one of the most competitive antivirus application out in the market (BitDefender). BitDefender was founded in 2001 and was developed by a Romania-based software company Softwin.