But any sequence of text can be represented as a number, given a suitable encoding. And that number will show up in the decimal expansion of pi somewhere. So clearly, text should not be copywritable either.

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.