KDE software is based on the Qt framework. KDE is mainly known for its Plasma Desktop environment, which is provided as the default work environment on many Linux distributions. KDE ( kde.org) is an international free software community, founded in 1996, producing an integrated set of cross-platform applications for desktop. How does commercial Qt licensing work? Do all my developers need to have a valid Qt license? The Qt Company exists to support both sets with the dual offering. The Free Software community has thrived because of these rules, but there are also developers who never intend to observe or cannot comply to these rules, and thus should get a commercial license. The freedoms are non-negotiable and absolute, the freedoms cannot be enjoyed selectively or partially, you also need to pass them to your users. The freedom to improve the program and release your improvements to the public, so that the whole community benefits.The freedom to redistribute copies so you can help your neighbor.The freedom to study how the program works and adapt it to specific needs.The freedom to run the program for any purpose.Use of open source licensing gives users four primary degrees of freedom when using Qt applications or devices: We believe in the Free Software movement where using software comes with certain rights, but also certain obligations. Ĭheck out which components are available under the different open source models in the Qt Product Map. Qt also ships with third party open source components that might require respective licensing compliancy, if used. Please note that there are parts of Qt that are only provided under GPL for open source users that will require you to license your application under a GPL compatible license. This is the primary open source Qt license, which covers the majority of Qt modules. LGPL – Any modification to a Qt component covered by the GNU Lesser General Public License must be contributed back to the community. Your users are granted rights founded on the four freedoms of the GNU General Public License. GPL – All users have the rights to obtain, modify and redistribute the full source code of your application. When selecting an open source license for your project, you contribute to free and open source software development by using Qt under any of the following licenses: LGPL version 3, GPL version 2 and GPL version 3.īasic Premises of the Qt Open Source Model
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