question about licenses in relation to games ...

["taxman" <taxman10m@mediaone.net>]

Would any of the GNU/GPL/etc licenses forbid putting an ad
banner within the code from which money would be generated?
So then the game itself would remain free, as in it would
not
be bought or sold, but profit off the game would be solely
from the ad banner.  Its a little hard to describe what I'm
getting at.  The freeware version of webferret does what I
am describing,
http://www.ferretsoft.com/netferret/download.htm