To Whom This May Concern:
I'm trying to create my own SGF editor in python as a fun personal side project, and as a learning experience. I also wanted to have something that made studying go on the computer a little easier, and thought this would be a good first step.
I tried to read through some of GNU Go's code for inspiration, and came across the go board and go stone images. I would like to use them in my program.
I know that all source files are distributed under GNU GPL. Does that include the image files? How can I legally use them? I am quite new to this, does that mean my program must also have a GPL if I decide to put it on GitHub, or put the source code somewhere public in order to get some feedback from more experienced programmers?