From http://www.darkandlight.net/chapitre.php3?id_rubrique=43〈=en:
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If the stuff you copied is considered a "comment" (was posted by a user logged into that web site rather than the owners of the website) You should attempt to contact the person and request him or her to license his contributions under the GFDL. If this fails, you need to rewrite the material in your own words.