We have filed for a trademark on the logo and name, hopefully that will be granted. We don't yet have a trademark policy. I've asked SFLC if they have a generic one that we could use, as we're not interested in being overly protective, more that we're interested in making sure others don't sue us for using our own name. But, that is a work in progress.
Ok. I'll add a trademark note where necessary. Who's the logo's (and the trademark's) owner?
The copyright on the implementation of the logo has not been consolidated. There are several people who have worked on the implementation, I believe that all of them would be happy with people using their work to promote Inkscape. That was their goal. The logo has been shipped with Inkscape for several years with the whole package being stated as GPL.
That's the goal. Promote Inkscape, and the artists who use it. Our drawings based on the original logo will be freely available. We plan to use a GPL license, or maybe a very permissive CC license (CC-by). But we can adapt it as soon as a copyright is clearly defined.
So, from a legal perspective, it's unclear. But, I think (IANAL), that as long as you use the logo in good faith to promote and improve the Inkscape project you'll not run into any problems.
I feel more confident now. :) Thanks for your answer. -- Nicolas