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Having said all the above, it is a big deal if they are messing with the files as part of the process because it's supposed to be a guaranteed master, basically signed by the engineer who produces it.
They do however compensate for the DAC the studio use and the DAC you play it back on. This could account for the problems the guy is highlighting.
To be clear, I don't use MQA and I'm not an advocate for it.
Well, there's always ears.
I don't get why anybody is still using any kind of lossy compression, that seems like it should be a thing which died out when we all got ADSL, since you can download 16bit/44kHz linear PCM as fast as you can listen to it once your data rate goes over about 1.5Mbps
Checking that a file is as it was intended to be is just an ordinary part of information technology and doesn't need proprietary methods.
Stopping piracy is basically impossible, anything which can be rendered to the human senses can be copied.