Which qt to download

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.

Please refer to section 2. Please refer to question 2. In practice, this for example refers to: Tivoization — Explicitly not allowing creation of closed devices where the end user does not have the LGPL granted rights for the Qt open source libraries DRM and hardware encryption — This cannot be used to circumvent these obligations Software patent retaliation — Where all users of the software are granted licenses thus making software patent retaliation of any potentially patented software in the distributed software meaningless.

These modules are only available under GPLv3 for open source usage. Alternatively you need to provide a written offer with instructions on how to get the source code. Please also note that this has to be under your control, so a link to the source code provided by the Qt Project or Qt Company is not sufficient. Dynamic linking is usually recommended here.

The user of your application has to be able to re-link your application against a different or modified version of the Qt library. It is your obligation to provide the user with all necessary tools to enable this process. For embedded devices, this includes making the full toolchain used to compile the library available to users.

Because of this redundancy the commercial distribution continues to work normally. We also had two separate servers to reduce the risk of failure in the open-source distribution, but unfortunately both of these are affected by the disk system failure at our cloud service provider.

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