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.
It depends on how you license and distribute your product. You will need to fulfill the license obligations for these licenses when using Qt in your product. Both licenses have the same intention, namely to protect the freedom of users to use and modify the software licensed under LGPL. LGPLv3 makes this intention very explicit. You have to provide means to the end user to install a modified version of the library licensed under LGPLv3 and run your software using that modified library.
In practice, this for example refers to:. The above freedoms cannot in any way be restricted by other licensing terms. If an application is not fully following all the obligations as outlined above, it is not allowed to be distributed at all. Usually, not. When using the commercially licensed version of Qt, we provide almost all of Qt under a commercial license terms.
So when using these modules, you will need to fulfill the license obligations of LGPLv2. Please also note that you can avoid using Qt Script, as the Qt Qml module contains a fully functional JavaScript engine that can be used instead. As a commercial license user, in practice, you only need to consider license obligations of LGPLv2. In case there is any doubt on whether the requirements of the open source licenses can be met in full, the commercial licensing option of Qt is often the best choice to avoid legal setbacks.
Qt for Open Source Development Before proceeding to download Qt for open source development make sure you are choosing the right license for your project. What to Consider The Qt framework is available under both open source and commercial licenses. Please note that it's not allowed to use both open source and commercial licensing in the same application or device. Visit the Qt licensing FAQ to learn more. Your Contributions Matter Since our funding comes from selling commercial licenses and services, it is essential that we reach commercial readiness as quickly as possible.
Qt has an online marketplace, featuring primarily free Qt extensions, including those produced by the KDE community. To learn more about what can be accessed, and even to host your own content, visit the Qt Marketplace. Get Started. Looking for Qt binaries? Frequently Asked Questions. Use of open source licensing gives users four primary degrees of freedom when using Qt applications or devices: The freedom to run the program for any purpose The freedom to study how the program works and adapt it to specific needs The freedom to redistribute copies so you can help your neighbor The freedom to improve the program and release your improvements to the public, so that the whole community benefits 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 Configuration Options for Qt page gives a brief overview of these. SBSv2 is a next-generation Symbian build system. Nokia Smart Installer for Symbian deploys the required Qt libraries to supported S60 and Symbian devices if the libraries are not pre-installed. To create your own Qt installation package, do as follows:. The Qt libraries are built with "All -Tcb" capability, so they can support all types of applications.
If you don't have a suitable certificate, you can patch the binaries in either of the following ways:. We've included a subset of the Qt demos in this package for you to try out. An excellent starting point is the "fluidlauncher" demo. To run the demos on the emulator simply navigate to the directory of the demo you want to see and run:. For more information about building and running Qt programs on the Symbian platform, see The Symbian platform - Introduction to Qt.
All older versions of Qt are available in the archive. Qt offline installer is a stand-alone binary package including Qt libraries and Qt Creator.
Windows Host. Qt Creator 6. If you need a standalone installer, please select the file according to your operating system from the list below to get the latest Qt Creator for your computer. The source code is available as a zip 68 MB Info or a tar. Be sure to check if Qt is supported on your platform and read the installation notes that are located in the Qt Documentation.
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