Thanks for all these great resources Sarah! I'm a little confused on the CC licenses though. It seems like you *skipped* from Public Domain to CC Share Alike. Isn't "CC-Attribution" *in-between* (permissions wise) those 2 choices?

I was once told by a CC person that you never really needed to make work PD, because CCA afforded all the same permissions and flexibility. He also made the point that a lot of people like the "sound" of CC-Share Alike, since it seems like "keep free culture free" but that Share Alike actually introduces a "viral component" that can create future incompatibilities, exactly as you've described.