Here is a brief list of external documentation you can find:

* IRC channel on EFNET, #pear

* PEAR manual documentation
 * http://pear.php.net/manual/en/package.authentication.liveuser.php

* API documentation
 * http://pear.php.net/package/LiveUser/docs/latest/

* ER-Diagramm
 * http://www.backendmedia.com/LiveUser/liveuser_db_schema.png

* The most complete tutorials around (from GVN Group)
 * http://www.gvngroup.be/doc/LiveUser/

* LiveUser Talk @ Cancun 2005
 * http://www.backendmedia.com/LiveUser/LiveUser.pdf

* James Y Stewart is startig a series of Liveuser-Tutorials in his Weblog
 * http://jystewart.net/process/?submit=Search+Archives&s=LiveUser

* LiveUser Talk @ International PHP Conference in Amsterdam 2004
 * http://www.backendmedia.com/LiveUser/LiveUser.htm

* PEAR Powerworkshop with LiveUser example @ International PHP Conference in Amsterdam 2004
 * http://www.schlitt.info/download/PEAR_Powerworkshop_Spring_2004.tar.gz

* Article on Authentication in "PHP Magazin" 03/2004 (German edition)
 * http://www.phpmag.de/itr/ausgaben/psecom,id,189,nodeid,60.html (the content of this arcticle is not available online and it covers authentication only - in other words, no rights management)/

* Article on LiveUser in "PHP Magazin" 04/2004 (International edition)
 * http://www.php-mag.net/magphpde/magphpde_article/psecom,id,595,nodeid,21.html

* LiveUser talk at PHPConf in Frankfurt 2004
 * http://www.limbourg.com/pres/2004/francfort_liveuser/

* Sample user/group/right structure
 * http://oss.backendmedia.com/images/LiveUser/LiveUser.png