I'm programming a game and am considering using some code released under the GPL license. I realize this means I will have to make the source code available and that won't necessarily be a problem even though I'll be selling the game, as long as I'm correct about the following few points (which I'm hoping someone can confirm).
Am I right in thinking that I will still have the copyright to any graphics or audio I created, and I won't be required to distribute them for free or under the GPL license?
Also, what about other external files that do not directly contain the GPL licensed code, specifically, in my case, separate files containing number arrays: would I also be required to distribute those?
I'm also assuming people won't be able to sell copies of the game. Is that right?