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I have a USB drive with Dropbox portable installed on it and since it has some of the data that I'd prefer not to post on public, I would like to know if there is any good encryption software that you could recommend. I use mostly Windows and on some of the machines that I need to plug in the USB drive, I do not have admin rights, so I would need the encryption to run without admin rights and without installation.
I have checked out freeotfe but it seems it is having some trouble running on Windows 7 64 bit as the drivers are not signed, also it needs to format the drive to encrypt it, which is something I do not want to do as I have other files on the USB drive as well.