Attribution
Allow others to copy, distribute, display and perform your copyrighted work but only if they give credit the way you request.
No Derivatives
Allow others to copy, distribute, display and perform only verbatim copies of your work, not derivative works based upon it.
Non-commercial
Allow others to distribute, display and perform your work—and derivative works based upon it—but for noncommercial purposes only.
Share Alike
Allow others to distribute derivative works only under a license identical to the license that governs your work.