this sounds really good!!
i hope the music industry is clever enough to do so, the comparision with the radio is really easy to understand...

back again to the legal thing:
how do i recognise a copyright protectet file???

as long this is not possible, how can i be judged for copyright violation??

(it's like i loose a 100€-note, someone else finds it, but does not know who's the owner...)

let's say i see a file of the-artist-formerly-known-as-whoever, i surely know it's copyrighted, but if i see a file from a band called orange moon ( my own band, our songs without copyright) how shall i know, that i can download them??