- Options (a) 'relicensing the artwork to GFDL' and (b) 'ask all contributors
to provide extra permission for wiki pages and artwork to be combined', both
require asking contributors to explicity release extra permission...
So, why ask for (a), which moreover lead to a inappropriate license for
artwork used with the operating system? Better ask for (b)!
For all these reasons I suggest:
- to *keep* the CC BY-SA license for all the artwork related with the operating
system (logos, wallpapers, themes, icons, buttons etc.)
- to license GNS's web pages under GFDL for texts and CC BY-SA for artwork
(images, videos etc.) inserted into the pages themselves (requesting extra
permissions just for these artworks, and updating the footer to
automatically obtain the permission to combine GFDL and CC BY-SA for any new
contribution in the future)