Qt windows gpl

We believe in the Free Software movement where using software comes with certain rights, but also certain obligations.

Use of open source licensing gives users four primary degrees of freedom when using Qt applications or devices:. The Free Software community has thrived because of these rules, but there are also developers who never intend to observe these rules, and thus should get a commercial license. The Qt Company exists to support both sets with the dual offering.

If you want to migrate from open source Qt to a commercial license, you should contact us directly to discuss about your options in practice. Each application store has their own unique terms and conditions, which may or may not be compatible with distributing applications under LGPL or GPL licenses.

The commercial license of Qt is compatible with the terms and conditions of all the leading application stores and thus typically the best choice for distributing a closed source application in various application stores. Products distributed under the commercial version of Qt must also be developed under the commercial version of Qt.

If you have already started the development with an open-source version of Qt and wish to move to a commercial license you need to have a written explicit permission from The Qt Company to facilitate this change.

The Qt Company reserves the right to grant the permission at its own discretion. If you are unsure of which license or version to use when you start development, we recommend you contact The Qt Company to advise you on the best choice based on your development needs.

Yes, it is possible to use both LGPLv2. Doing this does not require changing license in either of the libraries, and it is possible to select a proprietary license for the application, if desired. If LGPLv2. KDE is an international free software community, founded in , producing an integrated set of cross-platform applications for desktop and mainly known for its Plasma Desktop environment, which is provided as the default work environment on many Linux distributions.

KDE software is based on the Qt framework. In the early days of Qt, the KDE project and community was the biggest driving force in building the developer ecosystem around Qt.

In the very early days, Qt was already dual-licensed, but the source code was available under proprietary open source licenses. Compromises with KDE were sought to ensure that Qt would be available for their use under appropriate open source licensing even if Trolltech the company that founded Qt would be bought or go bankrupt. The license agreement has been updated couple of times over the years, mainly because of acquisitions around Qt or updates to licenses and platforms.

If software using these open source licensed libraries does not fully comply with the license obligations you will lose your license and related distribution rights. See the comparison chart for details. For more information, please see the FAQ. With Qt for Device Creation , you can create embedded devices with modern UIs with maximum performance. In addition to Qt APIs , it comes with a full embedded tooling suite built around the Qt Creator IDE , and additional embedded solutions that help you reduce your time-to-market dramatically.

Qt for Device Creation is a product available only under a commercial license. You can now click on the green triangle icon to run it.

After doing so, it should launch and you will see a window named MainWindow come up. You might also want to try a QML application. Build and run it as before. If the above steps worked you are all set up to develop with Qt on the desktop.

You can now create your own applications from scratch or start with one of the many examples or tutorials available within Qt Creator. Under the Start menu you will see a Qt section with entries for Qt Creator, as well as Assistant, Designer and Linguist in case you want to run these tools on their own. There is also an entry for a command prompt for Qt, which will have qmake and other tools in the path so you can work from the command line if desired.

If you want to go back and add or remove more Qt components, run "Uninstall Qt" which is the maintenance tool we used earlier. I hope that you now appreciate that setting up Qt for desktop development is easy and you can be up and running very quickly. This example covered one of the most common setups. In the future I plan to continue this series for beginners, covering how to set up on a development environment on a Linux desktop and how to compile Qt from source.

Assumptions and Prerequisites For this example I'll assume you are running Windows Click on "Download". Select to Add or remove components or Update components. Summary I hope that you now appreciate that setting up Qt for desktop development is easy and you can be up and running very quickly. Each add-on module specifies its compatibility promise separately. The Qt installers include the option of downloading the add-ons. For more information, visit the Getting Started with Qt page.

They are already part of Qt Core. In addition to the modules released as part of Qt 5, the following modules and tooling build on top of the Qt libraries to provide additional value.

They have their own release schedule, and are available under the commercial license. Qt Tools run on all the supported development platforms and facilitate the development and design of applications. We invite you to explore the rest of Qt. Documentation contributions included herein are the copyrights of their respective owners. Qt and respective logos are trademarks of The Qt Company Ltd.

All other trademarks are property of their respective owners. The following table lists the Qt essentials: Module Description Qt Core Core non-graphical classes used by other modules. Includes OpenGL. Qt Multimedia Classes for audio, video, radio and camera functionality. Qt Multimedia Widgets Widget-based classes for implementing multimedia functionality.

Qt Network Classes to make network programming easier and more portable.