For what it's worth, QlikView is quite flexible in regards to licenses, meaning "almost anything is possible". There are basically three Server licenses I won't explain in depth, since they are documented in the Server Reference Manual, and is always yoru Sales rep who is supposed to have the most accurate and up to date information. They are the Small Business Edition (SBE), Information Access Server (IAS) and Enterprise Edition (EE). But what is really important here is that there have been several changes (and big ones) regarding licensing from version 8.5 to 9.
For any commercial reason I cannot think of, you may have a license that allows several users but few documents to be loaded, as a reminiscence of an old license not updated, or did in purpose, because of the price, usage or whatever. I asked about the IAS because they usually are intended to deployments with few documents, and because in general, there are no document limitation in the current licensing scheme (versions 9 and 10). Of course, it may be anything else.