Single user - only one person at a time can use the e-book
3 user access - 3 people at a time can use the e-book
Unlimited user - there is no limit to the number of poeple that can access the e-book
The Library will purchase e-books with a usage model that is suitable to your class size and teaching needs, and that will allow sufficient access for your students. Please note that not all books ara available as unlimited user access, the publisher will determine the user numbers and access options.