The is more than a disc; it is a time capsule of the analog/digital transition. It represents a time when setting up a home theater required a tape measure, an SPL meter, and a willingness to annoy your neighbors with depth charges.
These were — not official. Video quality varied (often re-encoded from multiple sources), but audio could be kept lossy 5.1 as on original DVDs. THX DTS Dolby Digital 5.1 Ultimate Demo Disc DVDR