I followed the last days a interesting discussion about sponsored themes at WordPress. I’m real impressed about Matt’s answer today. I fully agree with his definition and understanding of free software.
I never thought to release wordTube or NextGEN Gallery under a other license than GPL. It’s my very small part for the large WordPress community and as I define it for myself a payback for the development of all the great free products like PHP, MySQL, Apache or a least WordPress.
The positive feedback, ideas and code changes I received are very motivating. Imaging the response on Windows if it was a GPL product ! I believe the whole development will be much faster than the 10000 unmotivated developers from Microsoft, which receive beside the money only a lot of pressure from the management.
I hope we didn’t encounter sponsored plugins sometimes…
alex.rabe 
fully agree. I’ve seen this comment from Matt also. His answer was straight and clear. Good point.
I don’t get the concept of sponsored theme or plugin for wordPress anyway. All wordpress community is based upon GPL and open source.
Can’t agree more. Gone read the discussion you mentioned.
Of topic: One other thing (for my little, yes very little :), contribution to your work), can you send me your email to dennis at twee-d dot nl. I’ve translated the wordTube .mo file (1.50) to dutch.
Greetz!
@Haller you find my email here : http://alexrabe.de/about/