It's complicated, because the upstream API documentation is derived from comments in the source code, using the gtk-doc documentation system used by GTK+ and related libraries.
Can you find a list of people who contributed substantially to the comments? You'd have to license source code under the GFDL (in addition to other licenses), which surely is not your goal. I don't think that is necessary; there are ways around it. -- Dr Richard Stallman President, Free Software Foundation 51 Franklin St Boston MA 02110 USA www.fsf.org, www.gnu.org Skype: No way! That's nonfree (freedom-denying) software. Use free telephony http://directory.fsf.org/category/tel/