alt Hacker NewsQt's license really isn't hard to figure out. If it's free software, you use the free software license. If it's propietary/commercial, you use the propietary license.
Qt's license really isn't hard to figure out. If it's free software, you use the free software license. If it's propietary/commercial, you use the propietary license.
You can also use most of the core components (labels, buttons, grid views, image and media players) with LGPL in commercial apps. Only the more complex and more value-adding components like charts are GPL.