@Michael, I do intend to use semantic data from Wikidata. I have seen the Terms of Use : http://wikimediafoundation.org/wiki/Terms_of_use ! I am not sure if, even though it is under CCL, copyright applies!!! Regards.

Ljubomir Jacic

Thanks, @Ljubomir, for your response. You may find some more information at the link below. Most of the work on Wikimedia is under CC-SA, I think. As I understand it, we can use, copy and alter the work, but have to publish this work (e.g. picture) under CC-SA as well. This does not apply for the whole paper the work might be part of. And we still have to place a reference to the creator, which is in accordance to academic ethical behavior anyway.

http://commons.wikimedia.org/wiki/Commons:Reusing_content_outside_Wikimedia/licenses

@Michael, I do agree with Your statement above. It is useful, of course.Thanks for link attached.