من یه ایمیل به شرکتش زدم و چنین جوابی برام فرستادن که خیلی جالبه و شاید برای بازدید کنندگان این صفحه هم مفید باشه :
Qt license is a named developer specific, that is, just like a driving
license, whomever holds the license will be able to use Qt with full
support to develop any project for a lifetime with all rights on the
intellectual property on developments, including entire source code. As
mentioned, each and every Qt license requires a named user with a
unique license number.
In your case, in fact 10 developer's license is required. However, I can
find the way so that perhaps if there are only 5 developers using Qt
all the time, we can negotiate further on this senario.
The price for Qt on Single Platform is 3,695USD/license, and for Multi
OS (including all Win/X11/Mac OS) is 5,295USD/license.