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In Reply to: RE: 28KHz anomaly, different album downloads. No 28KHz blip digitizing my own L.P. posted by AbeCollins on July 12, 2014 at 20:40:02
Could there be code embedded in the 28kHz signal? Have you looked at the 28kHz signal in the time domain? Does it spell out HDTracks in some code every so often? Or is Jimmy really dead?
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True. But if it is a watermark, when e.g. HDTracks sees a file somewhere it shouldn't be, and runs it through their "decoder ring", it would easily spit out the answer.
They've gotta be doing something more than just putting "headers" into these files, too easily removed. Heck, they could encode an indirect link to the purchaser (somehow), which would make complete sense. But also not *at all* easy to do AFAIK and not affect playback, but there are probably encoding tricks and I sure wouldn't know of them. There have been much more theoretically complicated processes used to safeguard stuff (e.g. I know you remember the old one of laser-burning a hole in a FD in a uniquely encoded position).
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