Do I have right to put Inscub logo in the footer?

Sorry for my bad English, it is not my native language.

I use The Edublogs Homepage Theme, many plugins from WPMU Premium.

Do I have right to put Insub logo in the footer of site, or not?

P. S. I am talking about this image: http://edublogs.org/files/2008/05/incsubsmalllogo.png