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The DBpedia license would force him to license his code under GPL or similar, no?

I haven't read the GNU Free Documentation License (http://en.wikipedia.org/wiki/Wikipedia:Text_of_the_GNU_Free_...), but I don't think so.

"DBpedia is derived from Wikipedia and is distributed under the same licensing terms as Wikipedia itself" http://wiki.dbpedia.org/Datasets#h18-19

Please correct me if I'm mistaken!