About:
Creative Commons (creativecommons.org) is a nonprofit organization that enables the sharing and use of creativity and knowledge through free legal tools.
Their free, easy-to-use copyright licenses provide a simple, standardized way to give the public permission to share and use your creative work — on conditions of your choice. CC licenses let you easily change your copyright terms from the default of “all rights reserved” to “some rights reserved.”
Creative Commons licenses are not an alternative to copyright. They work alongside copyright and enable you to modify your copyright terms to best suit your needs.
Creative Commons licenses allow the creator to define how their product is used.
Why would you use Creative Commons? https://creativecommons.org/about
Association of Research Libraries: Author Rights Resources
Association of College and Research Libraries: Scholarly Communication Toolkit
Science Commons Scholar’s Copyright Project: Scholar's Copyright Addendum Engine