Using the art for commercial project?

Using the art for commercial project?



I want to ask if the art from the liberated pixel cup is usable in commercial games? I saw that it's dual licensed under CC BY-SA 3.0 and GPLv3. What does this actually means?

So you can use the art in commercial projects but the projects must be opensource? Is that right?

I think this art is no option for commercial games. I'm an indie developer and have not much money. I often use open art and donate money to the graphic artist as soon the project gets money income. but if the art is licensed like this you cant use it, I mean you must publish your game under GPLv3 and everyone else can modify your game and make money out of it? That didn't seams right to me.