File talk:Hoftuepfel Schema nltxt.jpg
This image is a derivative (translation) of an image in the following article: http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-70605
The license info on that site makes it clear that the image is non-free.
The first-author of this paper is a wikipedia user and uploader of several other images on this page(User:Micha_Rosenthal).
He may have the rights to dual-license his images and drawings, but he is not the uploader of this particular image. It seems unlikely User:Rasbak has rights to re-license this image. This should be clarified.
User:Micha_Rosenthal may be able to re-license the image for use on wikipedia.
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