"It is a playback only decode system, which means that it's benefits are applied during the playback of standard Redbook CD's and is only compatible with that format."
This is wrong. It has to be recorded HDCD to be played HDCD so it is NOT "a playback only". In HDCD coding the least significant bit is switching dynamic range of the rest. It is known as "in band signaling". Playback on standard player is a little suspicious (if nothing else is done) since the least significant bit becomes garbage (noise). I believe that the sole purpose of introducing schemes like that is to make it very difficult to copy (HDCD) or impossible to copy (SACD).
This is wrong. It has to be recorded HDCD to be played HDCD so it is NOT "a playback only". In HDCD coding the least significant bit is switching dynamic range of the rest. It is known as "in band signaling". Playback on standard player is a little suspicious (if nothing else is done) since the least significant bit becomes garbage (noise). I believe that the sole purpose of introducing schemes like that is to make it very difficult to copy (HDCD) or impossible to copy (SACD).