Yes, and in two ways as far as I understand: 1) you use the LGPG license. Then you can keep your application closed source / proprietary as long as you link wi

Yes, and in two ways as far as I understand: 1) you use the LGPG license. Then you can keep your application closed source / proprietary as long as you link with the Qt libraries dynamically and provide your changes (if any) to the Qt libraries only; 2) you use the commercial license. Then you can keep everything closed if you want (and the requirement to link dynamically disappear).