Hi Tom
From the documentation:
Document CAL
A Document CAL allows one user to open one QlikView document. The license is perpetual and will allow the user to open a (but not "the") single document. When a user opens a QlikView Document and consumes a Document CAL the user will be stored against the QlikView Document. The combination of a user would be stored in QlikView Server like Named users (server PGO files) but associated with a Document name instead of the "full server".
Named User CAL
A Named User CAL is mandatory when deploying a QlikView Server (SBE or EE) solution. A Named User CAL (an identified user on a server) has access based on user identity and is valid for all documents on the server, therefore any number of concurrent sessions from one user on one machine at any time is allowed.
Session CAL
This license allows one user on one computer to access QlikView documents. This means any number of concurrent sessions from one user on one machine with the same client (e.g. AJAX, IE Plugin, etc) at a time is allowed. Anonymous users are allowed, no identification of the client users is necessary. Minimum Session time is set to 15 minutes.
Usage CAL
Another way to handle a large community of non-frequent users of QlikView documents would be the use of Usage CALs. A Usage CAL gives the End User the right to initiate one session (open a single document) per running 28-day period. The session may last a maximum of one hour. Any activity after the first hour has expired will count as a new session (without visible interruption).
