License for Extracted API Documentation

[Toshio Kuratomi]

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If a package has API Documentation extracted from source via doxygen,
gtk-doc, or similar, can the documentation have a separate license from
the code-source?  In the particular case I'm looking at (qof) the source
is currently under the GPLv2+ and the doxygen main page lists GFDL as
the license for the documentation.  The code in question has multiple
contributors but I don't know whether the inline documentation was all
created by a single person (who could dual license) or not.  I can ask
if that's important but would like to understand whether I need to or
not first.

- -Toshio
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