With the commercial license you also have access to the official qt support. Qt project means the open source software project initially created by nokia. 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. Qt contains also thirdparty code that is licensed under specific opensource licenses from the original authors. Commercial gives you full rights to create and distribute software on your own terms without any open source obligations. Qt licensed under the gnu lesser general public license lgpl version 3. Qt pronounced cute is a free and opensource widget toolkit for creating graphical user interfaces as well as crossplatform applications that run on various software and hardware platforms such as linux, windows, macos, android or embedded systems with little or no change in the underlying codebase while still being a native application with native capabilities and speed.
The newer version is a better license for free software patent clauses, tivoization while continuing to allow use in. Open source sources ids imaging development systems gmbh. At the beginning of every source file, you have to write something like this here for lgplv3 license. With the commercial license you also have access to the. And qt isnt offering me a free product, their terms are pay then develop your software. Closer analysis of the all os commercial qt license terms.
As a special exception, you may create a larger work which contains the output of this application and distribute that work under terms of your choice, so long as the work is not otherwise. Unless you dont violate requirements of lgpl license, you dont need to go for commercial. Of course proper licensing is necessary, but that is a matter for the freelancers and clients. Qt commercial license terms, independent developers important. Software or, alternatively, in accordance with the terms contained in. The qt company has a binding agreement with kde free qt foundation to ensure the availability of qt under certain open source licenses for desktop and. Qt commercial license terms, independent developers qt forum.
Qt pronounced cute is a free and opensource widget toolkit for creating graphical user interfaces as well as crossplatform applications that run on various software and hardware platforms such as. Other applications have licensing requirements that dont play nice with gpl, lgpl or qts commercial license. Some say that even if i use lgpl version of qt, i still need to submit my code. There are clients who want to hire qt professionals. Qt licensing explained what are the qt licensing options, and what should you consider when choosing the best qt license for your project. Open source licensing of qt free and open source software foss is software that comes with a license that gives users certain rights. If you choose to use the qt library under the opensource lgpl license, you may. Ill leave answering to someone more familiar with the lgpl, but my understanding is that you may license your own code under the mit license, and you may distribute your mitlicensed code alongside. Neither the name of the qt company ltd nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. For opensource licensed qt, some specific parts modules are not.
The commercial qt license gives you the full rights to create and distribute software on your own terms without any open source license obligations. All external contributions are licensed to the qt company allowing relicensing under both open source and commercial terms. Here we use the term proprietary application to mean any application that is distributed under the terms of a license that is not compatible with the relevant version of the gpl and has been. The kde free qt foundation is an organization with the purpose of securing the availability of the qt toolkit for the development of free software and. This software may be used under the terms of the gpl. The q public license qpl is a noncopyleft license, created by trolltech for its free edition of the qt. The qt open source edition is distributed under the q public license qpl. Some qt licensing changes were recently announced 1 by the qt company.
Qt licensed under the gnu lesser general public license lgpl version 3 is appropriate for the development of qt applications provided you can comply with the terms and conditions of the gnu lgpl version 3 or gnu gpl version 3. Qt licensed under our commercial license agreement is appropriate for development of proprietarycommercial software where you do not want to share any. Chocolatey is software management automation for windows that wraps installers, executables, zips, and scripts into compiled packages. This qt license agreement agreement is a legal agreement for the licensing. The qt company gratefully acknowledges these and other contributions to qt. Qt documentation is licensed under the terms of the gnu free documentation license fdl version 1. Capitalized terms used herein are defined in section 1. 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. Software licensing can be a complex and confusing issue, and ive already seen some misunderstandings on the mailing lists and. Qt commercial license terms, independent developers. The software available to download from ids imaging development systems gmbh includes some parts that are protected from access. Is it ok to use the mit license for a project that uses qt. Intially developed by trolltech, then nokia and now digia, it simplifies the task of writing and maintaining gui graphical user interface, crossplatform. Qt for application development is duallicensed under commercial and open source licenses.
This license applies to any software containing a notice placed. This license agreement is between beopen, having an office at 160 saratoga avenue, santa clara, ca 95051, and the individual or organization licensee accessing and otherwise using. For proprietary software, code under the lgpl is usually used in the form of a shared. I have heard too many conflicting sayings on qt licensing which confused me a lot. The q public license qpl is a non copyleft license, created by trolltech for its free edition of the qt. The intent of this license is to establish freedom to share and change the software regulated by this license under the open source model. At the end of your free 45 day trial of qt enterprise software, you must purchase a software license key for the appropriate products the software is being used with. It fails the debian free software guidelines, used by several linux distributions. In particular the right to use the software, to modify it, to obtain its source, and to pass it on under the same terms. Qt is guaranteed to stay free and open legal update. When you create an embedded device you typically have joint hardware and software distribution, which is subject to a distribution fee, please contact us for more information. This device is not currently supported for these products. On the paid version, you pay them to relicense qt under some other terms. Visual studio ide visual studio for mac visual studio code.
The license for prototyping seems to be the same one for release. Microsoft visual studio community 2019 visual studio. Qt started off with a commercial license in 1995, adding gpl in 2000. Consult the commercial license terms to ensure that you can actually do that. So im remaking a product and was approaching qt about the. Documentation contributions included herein are the s of their respective owners. Unicode license agreement data files and software 2016. Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files the software, to deal in the software without restriction, including. It provides an objectoriented interface to the qt4 framework. This qt license agreement agreement is a legal agreement for the licensing of licensed software as defined below between the qt. Phpqt is an extension for php5 that aims to write software with the qt toolkit. The commercial licence gives you the full freedom of releasing your product including you can hide the fact. Qt contains some code that is not provided under the gnu general public license gpl, gnu lesser general public license lgpl or the qt commercial license agreement, but rather under specific. The following page documents the opensource licenses used in different parts of qt.
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