Prevent Copying files from USB Drive without Disabling USB port

Today one of my friend called me up and was asking about this issue, but he also said that he want the USB drive to read files but don’t want to write files to it or copy from it for some security purpose. Suddenly i thought, is it possible to do it? i was little bit confused about it. Then i got some idea and was testing about it. and finally i got it. Using GP edit or Registry edit, one can