I agree, but movie DVDs and Blu-Rays contain DRM. It’s probably easy to break it (which is illegal btw) and get regular files out of it, but the practice of adding DRM is unethical and we shouldn’t reward companies that do it with our money. It’s also possible to record your screen when watching a movie on Netflix (at least when using GNU/Linux), so you would get a copy of that movie, but we need to have higher standards.

I think if anything contains DRM, you should either not use it or pirate it instead.