CC licenses provide free tools that let authors, scientists, artists, students and educators easily mark their creative work with the freedoms they want it to carry. You can use Creative Commons to change your copyright from "all rights reserved" to "some rights reserved." In other words, you can tag it "share," just like I tagged the Crash Course.
To learn more, please visit the Creative Commons section of the Copyright Crash Course.
This work is licensed under a Creative Commons Attribution-NonCommercial 2.0 Generic License.