I am always a little surprised SACD and DVD-A never became more popular and pushed by the big companies. These digital formats are nearly hack proof, especially SACD, as very few people have the equipment at home to rip these formats.
I think the ripping software never became popular because the formats themselves were not popular. Granted, it would take a custom firmware for a DVD drive to be able to read SACD, I'm sure one would be hacked up, if the discs were popular enough.