Actually, you can use iTunes and convert them to MP3s...you just have an extra step to take. You create a CD with the tracks on them and then pull those tracks off as MP3s.
I believe you can save a step, and burn an MP3 CD. This should convert the protected AACs to MP3 files. I seem to remember people installing a virtual burning device on their machine so they don't even need media to pull this off. It just would show up on another (virtual) drive.