QTeXEngine - Licensing Model

QTeXEngine is available under the following licenses:

QTeXEngine Commercial Version
The QTeXEngine Commercial version  is the appropriate version to use for the development of proprietary and/or commercial software. This version is for developers who do not want to share the source code with others or otherwise comply with the terms of the GNU GPL version 3.0. Read more
QTeXEngine GNU GPL v. 3.0
This version of QTeXEngine is appropriate for the development of applications where you are willing to comply with the terms of the GNU General Public License version 3.0.
Read more

License Comparison Chart:


Commercial version
GPL version
License cost
License fee charged
Free
Must provide source code changes to QTeXEngine
No, modifications can be closed
Source code must be provided
Can create proprietary applications
 Yes - No source code must be disclosed
No, applications are subject to the GPL and source code must be made available
 Updates provided
 Yes, to those with valid maintenance
Yes, freely distributed
Support  Yes, with valid maintenance agreement
Not included but available separately for purchase
Charge for Runtimes
No
No

QTeXEngine Commercial License

The QTeXEngine Commercial License is the correct license to use for the development of proprietary and/or commercial software with QTeXEngine where you do not want to share any source code.

You must purchase a QTeXEngine Commercial License from IONDEV Srl before you start developing commercial software. The Commercial license does not allow the incorporation of code developed with the QTeXEngine GNU GPL v. 3.0 license versions into a commercial product. Request an invoice >>


Royalties and Runtimes
For regular desktop applications, there are no royalties, runtime licenses, or other additional costs.

Purchase and Transfer of Commercial Licenses
The license is sold on a per-developer basis and assigned to an individual. To order one or more QTeXEngine Commercial Licenses please contact us. QTeXEngine licenses may be transferred, but only every six months and within the same organization. To transfer a license, or to discuss a more flexible licensing agreement, please contact us.

Benefit to QTeXEngine
The benefit is that license fees help us pay for further software development.

QTeXEngine GNU GPL v. 3.0 Version

This version is freely available for the development of open source software governed by the GNU General Public License version 3.0 (GPL).

This version is available for the development of open source Software for Windows, Linux, Unix, and Mac OS X under the GPL. Please note the following:

  • We provide the QTeXEngine GNU GPL v. 3.0 version with no warranty. Support is available separately for purchase.

  • The QTeXEngine GNU GPL v. 3.0 version may be freely copied and distributed, put on FTP sites and CD-ROMs, etc. under the terms of the GPL.

  • Based on the "Quid Pro Quo" principle, if you wish to derive a commercial advantage by not releasing your application under an open source license, you must purchase an appropriate number of commercial licenses from IONDEV Srl before you begin developing commercial software. By purchasing commercial licenses, you are no longer obliged to publish your source code.

  • If you wish to use the QTeXEngine Open Source Edition, you must contribute all your source code to the open source community in accordance with the GPL when your application is distributed.

Benefit to QTeXEngine
The benefit is that any changes made to QTeXEngine must be made available under the terms of this license.