A Creative Commons license is based on copyright and consequently applies to all works that are protected by copyright law. The types of copyright protected works include books, websites, blogs, photographs, films, videos, songs and other audio & visual recordings.
A Creative Commons license gives the author the ability to dictate how others may use his/her work—such as the right of others to copy the work, make derivatives or adaptations of the original work, to distribute the work, and/or make money from the work. A license does not give the author the ability to restrict anything that is otherwise permitted by exceptions or limitations of copyright law—including, most importantly, fair use or fair dealing. A license also does not give the author the ability to control anything beyond what is protected by copyright law, such as general facts and ideas.
A Creative Commons license applies to the work itself and authorizes everyone who comes in contact with the work to use it in grounds consistent with the license. For example, if Bob has a copy of your Creative Commons-licensed work, Bob can give a copy to Carol and Carol can use the work in ways consistent with the Creative Commons license. You then have a license agreement separately with both Bob and Carol.
A Creative Commons license is non-exclusive, which means that an author can permit the general public to use the work under a Creative Commons license and then enter into a separate and different non-exclusive license with someone else, for example, in exchange for monetary compensation.
(Source : CreativeCommons Home, http://creativecommons.org)