@Philosopher - Calibre Embed writes all the metadata to PDF's in an XML block. I'm not sure what PDF readers will show it, probably Acrobat, given that XML is Adobe spawn. PDF XChange Free does not show the XML metadata, but Pro might.
And as I posted in another of your threads exiftool will show it. That's the one I rely on, by default it shows everything without the xml verbage, just a simple two column list -- label:value.
BR
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