Applications created using Qt Quick are subject to the terms and conditions of the GNU Lesser General Public License as Qt Quick includes dependencies to QtScript and JavaScriptCore which are licensed under the terms of the GNU Library General Public License ("LGPL"). Qt Commercial Edition licensees that wish to distribute applications that use the Qt Quick need to be aware of their obligations under the LGPL. Individual contributor names and copyright dates can be found inline in the code. This library is free software; you can redistribute it and/or modify it under the terms of the GNU Library General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License for more details. You should have received a copy of the GNU Library General Public License along with this library; see the file COPYING.LIB. If not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
On the Qt web site, you can find a Qt Licensing Overview and information on Qt License Pricing for commercial editions of Qt and other Qt-related products.