Dear Bence Vörösmarty
There are any number of ways an image could legally appear on a web-page. It is not true that it is necessary to let you have a license in that specific form for the logo to appear, unless you warrant to users of your encylopedia that all materials appearing in it are CC licensed and may be reused under CC.
A logo of any kind is by its nature a proprietary mark that in any case quite unsuitable for CC licensing. Under no circumstances can a logo or other TM owner agree to permit others to use it freely or to adapt it, both of which are permitted by the "share-alike/attribution" license. That would destroy all of its value as a trademark.
It would be not be a problem for Chris Sawyer if you wish to display his logo in relation to a fair, factual, article about him or his work. But we can only permit this under a standard non-sublicensable agreement that permits you to use it in a specific context and with all other rights reserved. All Chris Sawyer's rights in the "Chris Sawyer" logo are reserved. For your information his mark "Roller Coaster Tycoon" is a registered European Community trademark, and he reserves rights in other games and their titles except where they are used by his publishers.
Best regards
--
Guy Herbert
Commercial Consultant on behalf of
Marjacq: 34 Devonshire Place: London W1G 6JW
t: +44 (0)20-7935-9499 f: +44 (0)20-7935-9115
http://www.marjacq.com/
