I would recommend **not to** use Wikipedia as primary source. Of course you can include support for downloading such articles, but please make the program ask for confirmation when downloading from Wikipedia.
Of course Wikipedia is a great encyclopedia, but the "free software" related articles there are too "open source"-ish. More than a matter of "personal opinion", I see another motive for all free/libre software related explanations/texts/talks to be under licenses that deny derivative works (including translations, unless these are authorized/reviewed first), that is related to communication noise and also removal of important information, and the possibility that the Wikipedia article gets outdated overtime.
