Can't you copyright a number? If you can copyright text, why not digits?
I think I need to link to "What Colour are you bits?" ( http://ansuz.sooke.bc.ca/lawpoli/colour/2004061001.php ) again, just because the issue is so confused. Basically, it boils down to humans' conception of reality being incorrect, so things like authorship are assumed, even though there's no unforgeable way to represent them in reality.