Trolltech QT license question

Can anyone here that is familiar with licensing QT from Trolltech
give me a moment?

I've searched through past newsgroup posts and it would seem from all
the discussions that my group would need a commercial license of QT for
our project; due to the fact that we plan a wide distribution of our
proprietary software. However we are planning to distribute it to our
associates for 'free'. What I would like to know is the cost of
software to end users an issue in determining whether or not we need to
secure a license for QT?

Clues would be appreciated.