I've been developing a mobile app to help players and GM in a RPG titled Anima Prime. The game itself is licensed in Creative Commons Attribution-Share Alike 3.0.
I'm no native speaker of English so I don't really grasp what the license really means. Therefore, I used this as the guideline.
Quoting from the site:
Attribution - Share-Alike (CC BY-SA) - This allows you to use the CC-licensed work in nearly any way so long as you say where and who you got it from, and the new work is also issued under a BY-SA license.
So it means I must mention the site from which I download the rulebook and who the author is and the app I've been developing must be licensed in the same exact license as the rulebook, doesn't it?
But this wiki said that CC licenses are discouraged for software. So what license I should use for my app? I intend it to be an open-source software.