I don't know enough about copyright law, apparently. Which is terrible, considering copyright law is integral to a writer's survival.
I do know that sc.com uses the following creative commons license:
http://creativecommons.org/licenses/by-nc-sa/3.0/Also, at some point in the past (recent past, anyway) the Founder was asking what people thought about switching from the CCL (as described above) to a general copyright...at least, that's how I'm remembering it. It was a post on the forums here some time ago...that's pretty much all I remember.