In particular the right to use the software, to modify it, to obtain its source, and to pass it on under the same terms. You can use this edition of qt to create and distribute software with licenses that are compatible with this free software license. For opensource licensed qt, some specific parts modules are not. Use of open source licensing gives users four primary degrees of freedom when using qt applications or devices. Why is qt licensed also under an open source license. Qt contains some code that is not provided under the gnu lesser general public license lgpl or the qt commercial license, but rather under specific licenses from the original authors the qt company gratefully acknowledges these and other contributions to qt. This is written down in our second free software license, the qpl. The qt company has announced changes to the open source licensing and product structure of the qt crossplatform application development framework that will further strengthen the qt community and. Qt is a commercial and open source licensed product developed by the qt. The q public license qpl is a noncopyleft license, created by trolltech for its free edition of the qt. Informal the state of being secret or confidential. Qt project means the open source software project initially created by nokia. Qt open source licensing changed and product structure. Qt documentation is available under commercial licenses from the qt company, and under the terms of the gnu free documentation license fdl version 1.
With the commercial license you also have access to the official qt support. The qt open source licensing is ideal for use cases such as open source. Qt examples are available under commercial licenses from the qt company, and under a bsd3clause license. We believe in the free software movement where using software comes with certain rights, but also certain obligations. This license agreement agreement is a legal agreement between the qt company as defined below and the licensee as defined below for the license of licensed software as defined below. However, as long as qtbased software is either open source or was developed under a commercial license agreement with trolltech, we grant permission to compile, link and run those programs with the open source edition. Note that some modules are available only under a gpl license, which means that applications which statically link to these modules need to comply with that license. Capitalized terms used herein are defined in section 1. Qt examples are available under commercial licenses from the qt company, and. This license applies to any software containing a notice placed by the holder saying that it may be distributed under the terms of the q public license version 1. Qt is available under both commercial licenses and open source gpl 2.
We recommend that programs that use qt also acknowledge these contributions, and quote these license statements in an appendix to the. Qt crossplatform software development for embedded. Qt is available under the following free software licenses. If you choose to use the qt library under the opensource lgpl license, you may either statically or dynamically link it. Qt for application development is duallicensed under commercial and open source licenses. Open source licensing of qt free and open source software foss is software that comes with a license that gives users certain rights. Information and translations of qt in the most comprehensive dictionary definitions resource on the web.
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