This document summarizes the anatomy and design of Creative Commons licenses. It explains that CC licenses provide a balance between all rights reserved copyright and open content by allowing others to share, collaborate, remix and reuse works. The licenses have three layers - a legal code, human readable summary, and machine readable metadata. There are six main licenses which combine four elements - attribution, non-commercial use, share alike, and no derivatives. The licenses range from least to most restrictive and all require attribution of the original creator. Fair use and works in the public domain are also addressed.