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From the FAQ:
Creative Commons licenses give you the ability to dictate how others may exercise your copyright rightsâ€”such as the right of others to copy your work, make derivative works or adaptations of your work, to distribute your work and/or make money from your work. They do not give you the ability to restrict anything that is otherwise permitted by exceptions or limitations to copyrightâ€”including, importantly, fair use or fair dealingâ€”nor do they give you the ability to control anything that is not protected by copyright law, such as facts and ideas.
Creative Commons licenses attach to the work and authorize everyone who comes in contact with the work to use it consistent with the license. This means that if Bob has a copy of your Creative Commons-licensed work, Bob can give a copy to Carol and Carol will be authorized to use the work consistent with the Creative Commons license. You then have a license agreement separately with both Bob and Carol.