Git Logo

Who owns the copyright to the Git logo as seen here?

http://git.or.cz/gitwiki/FrontPage?action=AttachFile&do=get&target=git-logo.png

Apress wants to use it on the cover of the Pro Git book and I'm not
sure who to ask about that - no name is listed on the wiki page
(http://git.or.cz/gitwiki/GitRelatedLogos).

Thanks,
Scott