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Do I have to buy Qt?
The only reason to buy a Qt license is if you need to run on a platform where dynamic linking isn’t possible – perhaps a settop box – or you need extra technical support. ps. Even if you don’t modify Qt you do need to provide the original Qt source if a customer asks for it.
Can I use Qt for commercial software?
Qt for Device Creation is a product available only under a commercial license. This allows you to, for example, control your device’s user experience, and build proprietary functionality on top of Qt and to lock down your device.
Can I use Qt Creator for free?
Is Qt Creator free? There is an open-source license which is free and a commercial license. The commercial license (Qt creator and Qt SDK) starts at $459/month.
Can I use Qt commercially for free?
Qt for Application Development is dual-licensed under commercial and open source licenses. The commercial Qt license gives you the full rights to create and distribute software on your own terms without any open source license obligations. Qt tools and some libraries are only available under GPL.
Can you use Qt libraries under the LGPL?
With the LGPL license option, you can use the essential libraries and some add-on libraries of Qt. This allows for keeping your application source code closed as long as all the requirements of LGPLv3 are met. More details are available below. Please be advised that some parts of Qt are only provided under GPL for open source users, not under LGPL.
Which is the best open source license for Qt?
The primary open-source license is the GNU Lesser General Public License v. 3 (“LGPL”). With the LGPL license option, you can use the essential libraries and some add-on libraries of Qt. This allows for keeping your application source code closed as long as all the requirements of LGPLv3 are met.
Is the Qt compiler available under commercial license?
The QtQuick or QML compiler will only be available under commercial license. The plan for Qt 5.8 is to merge the QML compiler into the Qt Declarative module and then make the QML compiler available under GPLv2, LPGLv3 and commercial license. The GPL world will be as nice and carefree as the commercial world from Qt 5.8.
Can a user change source code under LGPL?
It is recommended to either link dynamically, or provide the application source code to the user under LGPL. The user is allowed to change and re-link the library used in the application or device – including reverse engineering.