The QPL prohibits development of proprietary software. For Qt our Qt Professional Edition product is available for this. You may use the QPL to license your own software. We feel it is particularly well suited for anyone who wants to run an Open Source project and still have the possibility to earn some money to eat from sales to closed source commercial developers. Fewer license names makes it easier for people to know what license one is talking about.
Binaries can have the same name as the original - important for dynamic libraries.
The Qt Free Edition can be used to run software written with the Qt Professional Edition. Free software development with the Qt Free Edition is additionally protected by the KDE Free Qt Foundation . Your software can be licensed by any license that permits the requirements in section 6. Their backing and feedback have been invaluable during the process of making Qt Open Source. We would also like to thank Joseph Carter, from the Debian project, for his valuable input and Eric Raymond for his assistance.