I don't have handy a better link (the talks happened years ago) than
Eduardo Javier Echeverria Alvarado wrote:
> I'm sending this email behalf to Marcel, because each time it sends to
> the list, the system does not accept
https://fedoraproject.org/wiki/Logo#What_about_the_red_or_blue_hats.3F
The is, we were kindly asked by Red Hat not to use any hats (or fedoras)
so we don't confuse the audience and don't dilute any trademark.