Hi Karoly,
Check out these pages for the guidance you requested:

https://fedoraproject.org/wiki/Logo/UsageGuidelines
  https://fedoraproject.org/wiki/Legal:Trademark_guidelines

Hope this helps :)

Cheers,
Bryan 

On Wednesday, 16 December 2015, Karoly Livius Bakos <karoly.bakos@gmail.com> wrote:
Hey, I made some further attempt on the banner.
There is one back to "summer of 69" edition :) otherwise I 
tried to be a bit more modern.
However noone actually provided me any feedback on if I am using 
the fedora logo (text + infinity f) correctly.

Can anyone tell me if these versions are compliant to the guidelines
of fedora project?

I attached the 4 current desings and I uploaded to the design servce queue also.

 
Thanks

Karoly