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Qt is offered under a dual-licensing plan with open source and commercial options.
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With Qt, you can reach all your target platforms – desktop & embedded – with one technology and one codebase, minimizing your time-to-market and maintenance burden. Qt is available under a dual-licensing model — you choose what’s right for your needs.
If you are a commercial customer or an active evaluator, you can find your downloads either via the Qt Account portal or through the Maintenance tool in your Qt installation directory.
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A commercial license keeps your code proprietary where only you can control and monetize on your end product’s development, user experience and distribution – securing your intellectual property.
Qt ships with third party open source components that might require respective licensing compliancy, if used. See details of other licenses inside Qt.
These are the APIs and libraries that provide the backbone of Qt. Qt contains a rich set of fundamental enablers,which provide higher-level UI and application development components.
Qt is an unbelievably comprehensive framework full of features beyond the essentials.
Qt has it's own cross-platform IDE and is chock-full of tools designed for developing applications and UIs once and deploying them across multiple operating systems.
Qt has ready-made solutions that speed up your device creation with enterprise-quality features for a truly professional development experience.
The Qt Company’s expert support team helps you solve your development challenges.
Usage under (L)GPL v3 license
“When we speak of free software, we are referring to freedom, not price (… ) To protect your rights, we need to prevent others from denying you these rights or asking you to surrender the rights. Therefore, you have certain responsibilities if you distribute copies of the software, or if you modify it: responsibilities to respect the freedom of others.” – GPL preamble
The majority of the Qt modules are licensed under LGPLv3, meaning that you...
Does GPLv3 prohibit DRM?
It does not; you can use code released under GPLv3 to develop any kind of DRM technology you like. However, if you do this, section 3 says that the system will not count as an effective technological “protection” measure, which means that if someone breaks the DRM, she will be free to distribute her software too, unhindered by the DMCA and similar laws."
Click to go to the GNU (L)GPL FAQ.
From FAQ: Does GPLv3 have a patent retaliation clause?
In effect, yes. Section 10 prohibits people who convey the software from filing patent suits against other licensees. If someone did so anyway, section 8 explains how they would lose their license and any patent licenses that accompanied it.
Click to go to the GNU (L)GPL FAQ.
Depending on your choice of GPL or LGPL these obligations differ. The primary open-source license is the GNU Lesser General Public License v.3 (“LGPL”). Also, please note that there are parts of Qt that are only provided under GPL for open source users where additional obligations need to be met.
Learn more about your obligations when using the open source packages.
These are the APIs and libraries that provide the backbone of Qt. Qt contains a rich set of fundamental enablers, which provide higher-level UI and application development components.
Qt is an unbelievably comprehensive framework full of features beyond the essentials. Some features are limited to GPL.
Qt has it's own cross-platform IDE and is chock-full of tools designed for developing applications and UIs once and deploying them across multiple operating systems.
Limited to GPL only.
Limited to GPL only.
Qt has ready-made solutions that speed up your device creation with enterprise-quality features for a truly professional development experience.
The Qt Company’s expert support team helps you solve your development challenges.
Qt is available under a flexible 1-3 year term licensing model. Pricing is per developer seat per term. Pricing varies depending on selected features and functionality. Embedded projects may be subject to distribution fees – contact us to learn more.