I think, there is a contradiction in the text of the enwiki upload file page.
One statement says: "Specify the license ..... See Image copright tags (I chose something from the "zoo" of tags) The big statement at the end says "you MUST license under 1) GFDL or ... 2) PD
Can some please clarify this ? I mean, the last statement is clear: GFDL __OR___ PD
So the other sentence is misleading
Yours, Wikinaut
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* Specify the licence of the file by adding the appropriate tag(s), e.g. {{GFDL}}, {{PD}}, etc. See Image copyright tags http://en.wikipedia.org/wiki/Wikipedia:Image_copyright_tags for more tags. Please do not upload files under a "non-commercial use only" or "copyrighted, used by permission" licence. Such files will be deleted http://mail.wikipedia.org/pipermail/wikien-l/2005-May/023760.html (http://mail.wikipedia.org/pipermail/wikien-l/2005-May/023760.html). * Insert the file or image in relevant articles using the syntax [[Image:File.jpg|thumb|Caption]], and other media with [[Media:File.ogg]]. See Extended image syntax http://en.wikipedia.org/wiki/Wikipedia:Extended_image_syntax for further instructions. * Use a descriptive filename (e.g. "Eiffel Tower, Paris, at night.jpg") to prevent conflicts with existing files.
See Wikipedia:Uploading images http://en.wikipedia.org/wiki/Wikipedia:Uploading_images and Wikipedia:Sound http://en.wikipedia.org/wiki/Wikipedia:Sound for more information, and Special:Imagelist http://en.wikipedia.org/wiki/Special:Imagelist for a list of already uploaded files.
If you upload a file here to which you hold the copyright, you must license it under the GNU Free Documentation License http://en.wikipedia.org/wiki/Wikipedia:Text_of_the_GNU_Free_Documentation_License or release it into the public domain http://en.wikipedia.org/wiki/Public_domain.