The document discusses Creative Commons, a nonprofit organization that provides free and easy-to-use legal tools to allow creators to modify their copyright and choose how others can use and share their work. It describes the six main Creative Commons licenses from most to least accommodating: Attribution, Attribution ShareAlike, Attribution-NoDerivatives, Attribution Non-Commercial, Attribution Non-Commercial ShareAlike, and Attribution Non-Commercial-NoDerivatives. The licenses determine whether others can use a work for commercial purposes and/or create derivative works.