This is pretty obvious, but worth repeating. If your corporate network allows Internet P2P connections, then your confidential data is probably available on various file sharing networks. It’s just too easy to install one of these programs and let it share your My Documents folder by default. Then all someone has to do is search for .DOC files with the word “proprietary” in them and see what comes up. Unfortunately, blocking P2P networks can be tricky, since they use a variety of ports – some even actively try to evade firewalls by going through port 80.
InformationWeek: Beware P2P Networks With A Tunnel To Confidential Data
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