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Old 02-21-2014, 11:06 PM   #11
kovidgoyal
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Posts: 45,418
Karma: 27757236
Join Date: Oct 2006
Location: Mumbai, India
Device: Various
Yes the custom columns are embedded in the PDF on save. They are read even if no OPF is present. You can look at their definitions by running

pdfinfo -meta file.pdf

(pdfinfo is in the calibre install directory)
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