Creative Commons expands Copyright by giving content creators the ability to license only part of their rights. This stimulates sharing but maintains control. Flexibility of this kind can maintain the economic value of works while keeping the artists in control.
When dealing with a rights license, be careful you don’t give away more than you bargained for. And treat other people’s rights with equal zeal. We’re in this together. Two cases of rights issues show that rights can’t be taken lightly, or given easily.