> MiniDiscs had "copy protection"[0] and this format was supported by major record labels[1]. From what I can tell, pre-recorded MiniDiscs were never popular.

> MiniDiscs had "copy protection"[0] and this format was supported by major record labels[1]. From what I can tell, pre-recorded MiniDiscs were never popular. People bought blank ones and recorded their own pirated mp3s on there. But, yes, that makes me technically wrong with my first comment because it is a physical audio format that has the technical capability for DRM. > By starting with DVD, you're skipping the DRM-free formats of Betamax, VHS, and LaserDisc then? They're all analog and so you can't make an exact copy. At least not without obscenely expensive studio-grade equipment. Yes, that didn't stop people from making copies of VHS tapes, and yes, you could tell how many times it was copied by the picture quality.