The "data crystals" are a Babylon 5 tidbit, and I've heard that such a thing has been effectively created (not necessarily close to being commercially viable...). Supposedly you're talking data density that could get the friggin' Library of Congress on a golf-ball sized crystal!
Assuming you could access the data quickly and had a wide data pipeline, data compression schemes like DTS or DD would be irrelevant.
Piracy will probably always be an issue until some new business model is created that reflects the reality of the situation. I seriously doubt it's possible to create an encryption system that won't be cracked within a month, and creating ever more draconian punishments for copying will only lead to resentment & ill will. At any rate, how severely can you be punished and stay within the limits of the constitution? What's an fair punishment for "stealing" a $.99 song? How about a $15 movie?
I still think it would be great to have
one carrier, used for movies, music, games, data, etc. It would simplify the hardware end and streamline distribution considerably.
It's probably too good an idea to ever be implemented, though.