desLIbris offers four options for setting up user authentication.
Login with password: Any user can authenticate by entering a registered username and password to login. This access method is used by library account administrators and individual account holders; it supports only a single user. Individual passwords may be used to identify/authorize members of a Goup Account.
Authentication from IP address(es): This is the most common option for authenticating multiple users. Every internet user has a specific IP address. Institutional users (Libraries) generally have one or more static IP addresses (multiple addresses are known as an IP address "range".)
To set up IP authentication, a library registers its IP addresses/ranges with desLibris. Once this is done, the system can identify and admit any user coming from these addresses.
See here for more information.
Once IP authentication has been set up, there are two additional means of providing access to users who are entitled to use the resource through the library license, but are offsite (or away from the Library IP range.)
Proxy: Libraries may provide URLs or IP agents to serve as the authentication path. These URLS must be registered with desLibris. Then offsite users will be validated in the same way as they are when coming from an authenticated address or range.
Referring URL: This option is useful when a library has a portal where offsite (or onsite)
In order to fulfill this purpose, the system must authenticate users as being legitimate account holders.
One of the vital desLibris services is providing libraries with access to books under licenses which have been granted by participating publishers.
More information on Authentication