[Clipart] CC0 and Public Domain?

[chovynz]

Hi guys.

Got more cliparts to hide due to licence incompatibility. These are 
under CC-NC-BY-SA 3.0 <http://creativecommons.org/licenses/by-nc-sa/3.0/>
http://www.openclipart.org/index.php?pretty=detail/67159
http://www.openclipart.org/index.php?pretty=detail/67153
http://www.openclipart.org/index.php?pretty=detail/67147

I have one question.
Is CC0 compatible with Public Domain? I mean, can they licence it under 
CC0, then upload to OCAL, which then "Our version" becomes PB and the 
rest is covered by CC0 , or does it have to be only PD? The problem is 
that : PD isn't valid in many places outside of the USA.

Links for comparisions:
http://creativecommons.org/licenses/publicdomain/
http://creativecommons.org/publicdomain/zero/1.0/


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