I am working on software that contains graphics I didn't make, that are licensed under CC BY-SA 3.0.
Since the software contains other parts I didn't make, I want to put it under two different licenses. All the stuff I didn't/partly make will be put under the license it was under before, and my stuff will be put under some non-derivative license.
Now I'm worried that Copyleft may not allow me to do so. (because media is under CC BY-SA 3.0 and my software is based on it, it must be under CC BY-SA 3.0, too (strong copyleft) (?))
Anyway, this conclusion seems quite senseless to me, because CC BY-SA 3.0 isn't a software license.
Can I put the software under a dual license as mentioned before?