Thanks for your proposals folks. I see your point. I'm a poor old IT guy, so the "behind the scenes" part is well understood (at least now after that good explanation...)
(btw, sorry my english, of course I'm far to be a pro level at all)
What I cannot face, too lazy, is to read a book once more to apply changes which I noted reading it the first time on paperwhite (of course they are not encrypted, at least when I read them
)
Let's say Thomass suggestion could be approachable; I've got... it's the only one anyway
thanks to you all and free rain
p.s. what does OP mean?