There are some things that are common sense. For example, it's pretty clear that if someone licenses a software program with a free license, then a person using the software has certain freedoms involving the use and modification of the software. Other facts are not commonly known, however, and may require some (extensive) referencing. I've seen at least one or two cases where users were downvoted for lack of sources.
What should be our policy on references? Should we even have a set reference policy, or should it just be one or two quite informal ideas? I'm not looking for anything firm or strict, but we should, I think, have some structure to our policy.
Other ways of describing this policy are "Evidence policy" or "Back it up policy" (to help future searchers).