What is the license of generated files?

[Jeff Johnston <jjohnstn redhat com>]

I wish to use gtk-doc to create a test case for the Eclipse devhelp 
plug-in.  I have a simple C test with one function which I generate 
devhelp for.  The generation results in a set of files: a css file, the 
devhelp file, some .png files (home.png, left.png, right.png), etc... 
None have any license information.

Where can I find information regarding the license or lack of license of 
the various generated files?  I was unable to find anything in the 
gtk-doc manual.  I would prefer they would be unlicensed or under my 
control as there are restrictions on what can be stored in the 
Eclipse.org repository (e.g. GPL is not allowed).

-- Jeff J.