From ebrary (PDF):
ebrary expanding its support of strategic e-book acquisition with a new three-user license model for perpetual archive titles, providing an additional layer of flexibility for libraries between its single-user and unlimited multi- user access options. Multi-user access, whether unlimited or three-user, is now available for over 68% of ebrary’s perpetual titles from publishers such as Taylor & Francis, SUNY Press, Wiley, and University of Edinburgh Press.
ebrary’s three-user model is integrated with not only its own patron driven acquisition and Extended Access models, but also with YBP’s GOBI³ for firm orders as well as demand driven acquisition.
Read the Complete ebrary Announcement (PDF)