Otto got what I meant. It's not that code can't be CC, or that text can't, but you're not getting any benefit from having text be GPL.

Basically I got a dummy telling me 'You put your ebook out in CC! That's against GPL! You can't do that!' and, frankly, that's poppycock. If there'd been any code, I would have specified that the code was GPL2 or later. As there was no code, the text was CC. IIRC, so is the codex and WordPress.com (I asked Matt in passing once).