Dear Inkscape developers,
my name is Carsten Fuchs and I'm the main developer of the Cafu game and graphics engine, http://www.cafu.de
We're currently in the process of updating the user interfaces of our graphical editor applications, i.e. the Map Editor, GUI Editor and Model Editor. So far, our new icon sets are based on own artwork and icons from the GNOME Icon Theme 3.0, which is licensed both under the LGPL v3 as well as under CC BY-SA 3.0.
After a lot of work, we're still lacking about half a dozen icons, and found that the Inkscape Tango icons (tango_icons.svg) would not only be a perfect fit, but are also very nice and wonderful!
Do we understand right that the Inkscape icons are released under the same license as the Inkscape source code, the GPL v2?
If so, would it be possible to release them under, for example, the CC BY-SA 3.0 as well?
I'm asking this mainly because we're offering the Cafu engine both under the GPL v3 as well as under custom commercial license. At the same time, it generally seems widely unclear how the software-oriented GPL applies to artwork: e.g. if we exported about six icons from tango_icons.svg to PNG image files, and shipped them with our apps (both source code and binary editions) as separate files, i.e. not embedded in any executable or other file, and load them at runtime, would that still require us to omit them from our commercially-licensed packages?
I'd be very grateful for your consideration and advice.
Many thanks and best regards, Carsten