I hope more and more classrooms discuss Creative Commons and open source these days. With all the flexibility in content available, teachers really should focus on OSS content first, before proprietary content. Does this happen across the board, no, but hopefully with things such as the Software Freedom Law Center, you will see more of this.
Bradley and Karen, two council members with the Software Freedom Law Center produce Oggcast, a podcast that discuss things such as the various licensing on open source projects, like the GPL, Gnu Public License. They also look at other things such as the Free Software Foundation, an organization that lobbies for free software, as the name would imply.
I think all teachers, from upper elementary right on through high school, should listen to these types of podcasts. We are charged with providing a well-rounded education to students, and learning about the various licenses, organizations, and other things can help teachers guide their students to the right side of Copyright, Fair Use, Creative Commons, and more.
Check out Oggcast at: http://www.softwarefreedom.org/podcast/