Creative Commons provides free tools that let authors, scientists, artists, and educators easily mark their creative work with the freedoms they want it to carry. You can use CC to change your copyright terms from "All Rights Reserved" to "Some Rights Reserved."
They are a nonprofit organization. Everything they do — including the software they create — is free.
Creative Commons defines the spectrum of possibilities between full copyright — all rights reserved — and the public domain — no rights reserved. Our licenses help you keep your copyright while inviting certain uses of your work — a “some rights reserved” copyright.
 Types of Licenses
Creators choose a set of conditions they wish to apply to their work. Multiple choices are permitted.
 For more information
- See also: https://en.wikipedia.org/wiki/Copyleft for a different method of controlling a document.