However, would they had been agreed to that some future historian century after their lifetime would spend their career studying their reading lists, if they once turned out important enough? Or that this data would be used to research what kind of books people read, for some obscure cultural history research project?<p>Heck, many people keep personal diaries, and most surely would object to people reading them without their permission while they are alive. On the other hand, their diaries are prime sources on given person&#x27;s life to biographers, which is one reason some people keep them.<p>I understand literature and history departments at universities love this kind of sources.