In recent ELinks release announcements, I have described:
This release of ELinks is mostly licensed under version 2 of the GNU
General Public License. More permissive licences apply to some parts
of it, and there is also one test file under the GNU Free Documentation
License; please see COPYING for the list.
Remove that test file, so its GPL-incompatible licence need not be
mentioned in future announcements. The file however remains
downloadable as part of the elinks.git repository and releases like
elinks-0.11.6.tar.gz. Those should still be covered by the licence.
test/optgroup.html was added on 2004-04-17 with no comment about licensing.
I contacted the author via <http://iccl.fi/feedback.cgi?id=mail>, asking
for a licence. The author noted that a developer of ELinks had originally
asked on the #debian.fi channel whether the file could be used, and he had
allowed it then. That permission grant had not been recorded in the source
tree though, and it is not clear whether modification had been allowed.
Anyway, the author now explicitly grants us the GNU free documentation
licence on this file, and is willing to consider other licences.