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wikipedia allows users to hold the copyright to any text that they submit under creative commons attribution sharealike 3 0 unported license cc by sa and gnu free documentation license gfdl unversioned with no invariant sections front cover texts or back cover texts. however both of these allow your contributions to be used commercially.
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You publish your contributions under free licenses
{'wikipedia.org'}
Wikipedia allows users to hold the copyright to any text that they submit under: Creative Commons Attribution-ShareAlike 3.0 Unported License (“CC BY-SA”), and GNU Free Documentation License (“GFDL”) (unversioned, with no invariant sections, front-cover texts, or back-cover texts). However, both of these allow your contributions to be used commercially.