It is also possible that what you saw on Wikipedia may first have been developed on OrthodoxWiki and then exported there, which is also legal, given the terms of the OrthodoxWiki dual license. See: [[OrthodoxWiki:Copyrights]].
==What about advertising my product/service/website?==
Limited links to such sites may be included in the appropriate ''External links'' section in appropriate articles when such links appreciably add to the information in the article. This means that the link must not only be related to the article's subject matter, but it must be informational regarding its subject, as well.
Advertisements as such may not be included. This is an encyclopedia.
[[Category:OrthodoxWiki]]