I've just encountered this posting in the other thread illustrating what I expect to happen a lot with the M92 (metadata issue):
https://www.mobileread.com/forums/sho...2&postcount=62
An X60 user complains that
"Using a blank pdf as a template – the scribbles are lost when I rename the template."
I really think that hiding the metadata from users (or storing in a way that its connection to a document is not obvious) is a bad idea.