Are some combinations of the custom license options incompatible?
There is one combination of options that does not make sense: No Derivative Works combined with Share Alike. This combination does not work because the Share Alike condition applies only to derivative works. If you choose both options, we’ll give you a friendly reminder about this and ask that you please make your selection again. Note that every Creative Commons license requires licensees to attach the original license terms to every verbatim copy they distribute. So if you copy a music file licensed under a noncommercial license, you must tell the world that your copy of that file is also licensed under a noncommercial license. The Share Alike option simply extends this requirement to all derivative works as well. So if you were to use that same noncommercial MP3 in a documentary film, the Share Alike provision would oblige you to license your film under a noncommercial license, too.
