Hm, with the addition of a CD-R copy, two individuals are able to listen to the music at different locations at the same time. I guess this can be compared with a single user software license: a single user license allows the license owner to install and run the software on one computer. If I want to be able to run the software on a second machine of mine (not even on a friend's and *spending* money to do so is also involved here - second computer with all its devices) I'd have to buy another license.