The document summarizes the key changes between different versions of Creative Commons licenses from version 1.0 in 2002 through the current version 4.0 released in 2013. It provides a high-level overview of improvements in each new version, including expanded scope beyond just copyright, improved international usability, additional attribution requirements, and compatibility mechanisms for sharing and remixing works. The summaries focus on general features while noting that differences between specific licenses are not fully described.