Licenses.  Attribution (BY) = others can copy, distribute, display, perform and remix your work if they credit your name as requested by you. No Derivative Works (ND) = Others can only copy, distribute, display, or perform verbatim copies of your work. Share Alike (SA) = Others can distribute your work only under a license identical to the one you have chosen for your work. Non-Commercial (NC) = Others can copy, distribute, display, perform and remix your work but for non-commercial purposes only.