I mean actual authentic DVDs that I've purchased. I'd like to rip the files to my computer and disassemble them; menu images and background audio, video, chapters, special features and everything else that you'd find on a DVD.
I don't expect Apple to include this, but surely there is a way to extract this information, convert it, if needed, and piece it back together as an iTunes Extras file.
I'd love for there to be a simple way to do this, just as it's simple (and legal) to rip and convert a CD that I've purchased to a lossless format on my computer. I don't know why DVDs should be any different.