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The Estonian books I’ve bought also tend to have my name (and in some cases email) on the title page, together with the name of the bookstore, date & time of purchase and order number.
I guess it varies and each seller/bookstore has their own methods. I have no idea if / what kind of hidden data there may be in addition - I guess the “digital ex libris” being visible is already a deterrent for the most casual kind of sharing people might do. (Not deterring pirates as that info is quick and easy to edit out, but I suppose it serves as a reminder to the buyer that the book is tied to their person.)
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