A mate of mine, a PC user, bought himself an iPod nano and downloaded some songs to it via iTunes. Now whenever he plugs it into the PC all the songs are 'grayed out' and he can't change the songs on it. He has given it to me to try - on a Mac. When i plug it in, although I can see the songs they are 'grayed out' and a lock appears on the right hand side of the number of songs/space left info at the bottom of the screen. Simple question really - why is it locked, and how can I unlock it? Many thanks for your help.