The CC concept is a new and very interesting concept to me. The “revers permission” is very intriguing and matches the open world of cyberspace.
the students will have lots of uses for this method in their projects, by being able to retrieve needed material from the web.
I have used YouTube in my lessons often, but did not use flicker before- I am planning on doing so soon.
In my opinion, the owner of the material is the original creator and anyone who improves on it (with permission, of course).
The potential negative for this system could be- enforcement of the guidelines may be difficult to control, and is explained very well in the blog by Scott Barodell.