[Gimp-user] 'Legal' questions about GIMP (CLA, trademark and maintainer)

[Gabriel CANIVET <gabriel canivet imt-atlantique net>]

Hello,
I am a French engineering student and I'm currently working on a presentation of the ecosystem around GIMP 
for my Software Economy course.
I found most of my answers on gimp.org and other websites but i am still clueless for a few questions (three 
plus a bonus one to be exact).
I hoped to find some answers here. I am not sure this is the right place to ask these questions but maybe 
someone could direct me to a better place if it isn't.

1. Is there any contributor license agreement (CLA) to GIMP ? Or in another words who own the source code of 
GIMP, each individual contributor or an sole entity?

2. Is GIMP a trademark ? Is there any restrictions about using the name GIMP for other softwares?

3. How did Michael Natterer become the current maintainer ? Is he only a big contributor to GIMP or does he 
have more rights than other, and if it is, who gave him those rights?

And lastly another less important question :
4. What is the exact relationship between the GNOME Foundation and GIMP ? On one hand the website gimp.org 
tell that there is no foundation or company behind GIMP but on the other hand the GNOME Foundation is hosting 
several parts of the GIMP project (mailing lists, repositories and donations).

Hoping to find some -full or partial- answers,
Gabriel Canivet