http://www.zdnet.com/article/how-to-use-linuxs-built-in-usb-attack-protection/ Interesting. I had not been aware of this tool. Although I don't think that I need it ...
I don't see how this can protect against LiveCDs. Because USBGuard is an app in the installed Linux. And so it's just dead bits on a disk while the LiveCD is booting. You can disable USB ports in the BIOS, however. Or disconnect them from the motherboard. Or fill them with epoxy.
Yes, I agree. I think this tool is useful in enterprises where sysadmins can stop employees playing with USB sticks. A fool-proof solution, indeed.
If someone has physical access to your hardware, you have a much bigger problem than wannabe Jason Bourne games. Mrk