There is a de-drm tool that I used to use which packages some other open source. For whatever reason, I always assume people who package up software are careful about what they're packaging up, but no, as it turned out this project is not careful at all. It shouldn't have been surprising but it was.

(I ended up writing my own tool. I de-drm on principle; I don't mind buying stuff, I am deeply offended when that stuff vanishes out from under me because of deliberate obsolescence and/or shutdown. Buying DRM-free is not always an option.)