Comment: Re:So do the libraries (Score 5, Informative) 191
Most libraries have privacy policies that state they delete the record of a book being checked out once it is returned. For example, you can find the policy for NYC public libraries here: http://www.nypl.org/help/about-nypl/legal-notices/privacy-policy. They even state that they backup their data, and the record of your returned book may exist for an additional 4 weeks in their rolling backup system. I love that they give you this level of detail into how they operate.