For Ref (Google)
Force Chrome to fully kill a session when a user signs out or closes their browser i.e. don't run in background or save data to a users profile.Only for Apps domains and set at admin level as a policy. Needs Sync to be set too to be effective.
"calibre introduces Open Books, a site for easy browsing of DRM-free e-books (e-books without DRM) that are not in the public domain. calibre has a cornucopia of features including library management, e-book conversion, syncing with devices, news download, e-book viewing etc, but to make the most of these features with your e-books you need to ensure your e-books do not carry DRM"