To be honest, I had only a bare bones beginning knowledge of copyright and public domain and I had no idea about fair use and Creative Commons. I had an idea that there was an exception for education but no details. The class I started in Spring of 2012 had a link to Brad Templeton’s 10 Myth paper. It was written in a simple and clear way and I would return to that document and some of the other links that you provided for specific information/situations. Rich Stim’s page was clear and useful as well. I found the 4 factors for Fair Use to be helpful in my understanding.
Some of the things I learned: Copyright lasts a lifetime plus 70 years; It is better to always ask permission; Creative Commons images at the bottom of a work give you information about acceptable use and sharing; Fair Use almost always only allows for a portion of the work to be used; Copyright gives the creator the right to control who can make copies and who can make works derived from their creative work.
I got 17 of 20 on the quiz. (My previous results. I couldn’t get the quiz to work properly this time.) I don’t think my first graders would do well on this quiz. It is not really 6 year old appropriate material. I do usually have a discussion with them about copying others’ work versus producing their own. I don’t think I would go much further than that although I think my understanding of fair use/copyright might help me to be more clear in what I communicate.