Creative Commons
Attribution:
You let others copy, distribute, display, and perform your copyrighted work—and derivative works based upon it—but only if they give credit the way you request.
Share Alike:
You allow others to distribute derivative works only under a license identical to the license that governs your work.
Non-Commercial:
You let others copy, distribute, display, and perform your work—and derivative works based upon it—but for non-commercial purposes only.
No Derivative Works:
You let others copy, distribute, display, and perform only verbatim copies of your work, not derivative works based upon it.