In dLibra, for every library user it is possible to define a number of access domains so that, from some places in the Internet, the user can access the library without authentication, from other - access is denied or requires entering a password.
The most important part of an access domain definition is the set of addresses the access restrictions should apply to. The address can be defined by specifying:
For every library user any number of rules: address -> action can be defined. The action can be either to allow access without authentication (without entering a password) or to deny access. The rules can be defined in User Properties panel, Access domains tab.
Use the Add button to add new access domains and the Delete to remove access domains. In the Domain Properties panel - address type and action can be specified.