It's a meta tag; they're supposed to be superfluous. But they often provide a historical trail of where a file has been, and/or what's been done to it. Delete them or don't. There's only a handful that might be relevant where making Kindlebooks is concerned (and of course the calibre ones that some devices/apps have adopted for library management ... but end users will just have calibre add those regardless).
My advice??? Don't stress over them one way or another.
Last edited by DiapDealer; 02-13-2017 at 02:10 PM.
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