question about Flare art license

question about Flare art license

Hello there, first of all kudos for the whole Flare project, it is amazing work.

I am developing a free mobile RPG, (although eventually I may support it with ads or other models).

My question is, can I use Flare art as a base to build my art assets?

My first concern is, in the Flare website it says (on the bottom of the page) that art is licensed CC-BY-SA 3.0, however, here:

http://opengameart.org/content/classic-dungeon-walls

http://opengameart.org/content/stone-and-wood-barricade

and in other similar posts, it is stated as CC-BY, not requiring sharing alike.

In case I used art under CC-BY-SA 3.0, would that force me to release my source code as well, or just the art?

And I really have no problem with attribution, but sharing the art, I am really not sure how can I share content through an android/iphone app marketplace, as it just allows you to share your packed app and normally it even forbids to link to external downloads... 

Thanks in advance for shedding some light, I am rather ignorant on these matters ;)