USB Block prevents leakage and copy of your data to USB Drives, External Drives, CDs/DVDs or other such portable devices. Once installed, USB Block lets you block all such drives and devices that do not belong to you. It prevents illegal copy, leakage and duplication of your private files. USB Block works perfectly on all 32-bit and 64-bit versions of Windows 7, Windows Vista, Windows 2008 Server, Windows XP and Window 2003 Server.