Q: Can I apply a Creative Commons license to software?
A: We recommend against using Creative Commons licenses for software. Instead, we strongly encourage you to use one of the very good software licenses which are already available. We recommend considering licenses made available by the Free Software Foundation or listed as “open source” by the Open Source Initiative.
https://wiki.creativecommons.org/Frequently_Asked_Questions#...
RavenDB is a company that offers a dual license commercial and AGPL. http://ravendb.net/docs/appendixes/licensing You may be able to glean some information on how they do it.
For a sampling of how complex the legal issues around the GPL are: https://en.wikipedia.org/wiki/GNU_General_Public_License#Lin...
However, note that, say, an MIT licensed or BSD licensed or Apache licensed project, developed for noncommercial use, would be prevented from using your library for their layout, because then the non-commercialness of the CC BY-NC could "infect" their project and prevent them from using those licenses. For instance, the Highcharts license caused this project to switch to a competing library altogether: https://github.com/sebastianbergmann/php-code-coverage/issue...
In general, there's no good solution, but I personally shy away from CC-licensed code.
(I am not a lawyer, and this should not be construed as legal advice.)