[Tango-artists] License of the ArtLibre set

[Daniel Maleike]

Dear Tango-Artists,

Im one of the developers of an application for working with 3D medical  
images (http://mitk.org/wiki/Screenshots), which is available in  
source code under a BSD-style license.

We know that our appliation is currently very inconsistent in its use  
of icons and we would like to change that. Now we found the Tango icon  
set, which looks really nice, comes with clear guidelines, and has a  
suitable license.

For some application modules, the ArtLibre set (http://tango.freedesktop.org/ArtLibreSet 
) contains useful icons. However, the license reads GPL. I am familiar  
with the GPL for source code, but I do not know its implications on  
icons and their use in applications.

My question is: are we able to use the ArtLibre icons in our BSD- 
licensed application without changing the license of the application?  
Or: is there any discussion going on regarding the licensing? Or: can  
the iconset be licensed under different conditions for a specific  
purpose such as ours -- then who would be responsible?

Thank you for any hints.

Kind regards,
Daniel