> CC-0 is public domain so you do not get credit
I think you need to add the qualifier "necessarily" to that. If the credit is
included with the work, I don't think most people would actively remove it,
and as this song puts it:
http://questioncopyright.org/minute_memes/credit_is_due
People who do remove the credit, or worse, claim that they wrote it, are
largely viewed as "arrogant jerks" (or something similar) by everyone else.
In any case, CC BY and CC BY-SA are perfectly good. Actually, CC BY-SA is the
best, I think.
