The block requires OpenBiblio library software, version 0.6 or higher (downloadable from http://openbiblio.sourceforge.net).
This block reads the OpenBiblio database, pulls out which books a Moodle logged-in user has borrowed and shows them with their due date.
Moodle needs to be able to read the OpenBiblio database and needs to know how to identify someone in that database. Any field in the user profile is possible. These settings can be put on the OpenBiblio block settings page in the blocks administration menu.