Users have the option of licensing their contributions under whatever terms they want, as long as it includes Appropedia's standard license. Note that these additional license options apply only to the specific original content contributed by that user.
We might encourage users to use template notices on their user pages.
An additional notice might be created to say: I am generally willing to release my contributions under Public Domain, on any reasonable request.
Note that copyright (and therefore any restriction or requirement made by an open license) do not apply to very minor edits such as sentence fragments or slight rewording that only affects a sentence or two. (Copyright seems to only apply to work of more than say 2 sentences,[verification needed] but this is not clear and may vary according to legal jurisdiction).