A little light reading for those interested in Digital Rights The theory behind this "solution" The excecution This is certainly an interesting approach, but the first thing that popped into my mind was why not just host all the keys for my music on a web facing machine, and provide links to these files. Set the permissions on these files to be read only, and bobs you're uncle. Of course, I can think of ways they could prevent this, but none of them are particularly user friendly; for instance, requiring the key and the file to be on the same machine. In this case, what of people with networks? Furthermore, what of MP3 playing stereos? How will the car know if its allowed to play this file or not? (sound like any other type of DRM you know of? iTunes anyone?) I admire their ingenuity, but this will never fly.