QV Server: is a program that is installed in a physical server(computer) with number of CALs these allow user to access QV files on the server. QVS controls the people who can access the documents on server using client access license(CAL).
QV Publisher: is a program which allows you to maintain centralized control of all your QV files and to schedule when and how they reloaded and distributed. You can automatically reload files and distribute them to web access points or by email or intranet. You can do data reduction also.