Should there be a disclaimer of some kind on the disc itself? Maybe one which explicitly states this set is only for genuine owners of the THX laserdiscs, and distribution is on the condition that it is used as a digital back-up for them...?

But I don't know if that is the intention of the X0 project. The X0 project doesn't seem to be for people who own the thx laserdiscs, it seems to be for those who would like to own the thx laserdiscs... without the hassles, problems, or cost involved with it.