The real answer to your question is that radio stations (and other broadcast media) have specific rules that they must adhere to, most of which make it unfeasible for someone to attempt to copy an entire album off the airwaves.

If there are such rules, nobody at the radio station(s) where I work knows of them. Irrelevant, in any case, because good programming practices (i.e., playlists design to capture and keep listeners) would dictate pretty much the same thing.

But the whole concept of broadcasting the music for free vs. infringing on the author's rights gets pretty fuzzy. I am obviously not infringing if I listen to his music on the radio. How 'bout if I like the song so much I sing it in the shower? Still no infringement. Maybe I like it so much that I laboriously copy down all the lyrics and write the song out on sheet music? Well... maybe that starts to infringe? Let's say I take a portable, monaural tape recorder and set the microphone next to the speaker of my clock radio and record the song the next time it plays? Yes? No? How about making a digital recording from a DAB broadcast? How about making a byte for byte identical copy from the original CD and selling it? Certainly that is an infringement. So we went from certainly no infringement to certainly yes infringement -- but where is the line?

tanstaafl.