= CC BY-SA
{c}
This one strikes the right balance between restriction and permissions. NC and ND are simply too restrictive.
TODO where does the SA boundary end? E.g.:
* <software>: https://opensource.stackexchange.com/questions/173/what-do-i-need-to-share-if-i-include-cc-by-sa-artwork-in-my-software/11323\#11323
* <video game>:
* https://gamedev.stackexchange.com/questions/92536/is-it-legal-to-use-creative-commons-art-in-a-commercial-game/189293\#189293
* https://www.reddit.com/r/creativecommons/comments/5nn01q/using_sharealike_music_in_a_video_game_must_i/
* <website>: https://graphicdesign.stackexchange.com/questions/68805/using-cc-by-sa-3-0-images-in-website-does-share-alike-affect-my-websites-lice/145124\#145124
* book: https://academia.stackexchange.com/questions/48375/using-images-with-cc-by-sa-license-in-slides-or-a-thesis
* <music> in a podcast: https://opensource.stackexchange.com/questions/7022/using-cc-by-sa-music-in-a-podcast
Does source code need to be redistributed: https://opensource.stackexchange.com/questions/1849/does-the-cc-by-sa-license-require-that-source-code-of-derivative-works-be-shared
Case law list on the CC wiki: https://wiki.creativecommons.org/wiki/Category:Case_Law