It would appear there is pretty strong consensus to implement the share-alike provisions available from Creative Commons. So, I've added that provision to the site license. And while there is not as much consensus, it looks like the stronger preference is to not limit use of materials from this site to non-commercial. So, I've removed that restriction.

I have updated the Standard Operating Procedures page as well to address some of the other issues that have been raised (form of attribution, what to do about inconsistent licenses). Realizing no "perfect" solution can be crafted when dealing with such gray areas, I've done my best to craft things so stuff posted here becomes part of a "commons" and respects others' licenses/copyrights/etc. at the same time.

As always, continuous review and suggestions for improvement are always welcome!