[CentOS] The use of Centos logo

Hi all,
A friend of mine asks me to teach him Linux using RHEL5. But, I insist that 
rather than using RHEL5, we use Centos5 instead, and he agrees :)
So, I'm thinking of giving him a "certificate of attendance" and putting 
Centos logo on it. May I do that? What is the guidelines?
Thank you :)
-- 
Fajar Priyanto | Reg'd Linux User #327841 | Linux tutorial 
http://linux2.arinet.org
09:31:35 up 25 min, 2.6.22-14-generic GNU/Linux 
Let's use OpenOffice. http://www.openoffice.org
The real challenge of teaching is getting your students motivated to learn.
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