I can think of at least 3 different ways to integrate with qlikview.
1- Add a link to a QlikView Application (no extra licenses needed).
2- Add a webpage webpart and open a full qlikview application in there (no extra licenses needed).
3- Buy QlikView Webpart and add any qlikview chart or object to your MOSS page (you need a qlikview webpart license).
In all 3 scenarios, every user accesing qlikview, directly or through a webpart, would need to have a CAL available.