I would like to use PyQT5 and QT5 to create an -internal- application for a friend and his company. I would like to use PyQT GPL license and QT LGPL license.

To respect these licenses, I need to:

  • give him the source code when the application is done;
  • create a msgBox that defines what QT is, with links to their licenses;
  • provide a copy of the GPL license;

Is it correct? Do I forget something?

2 Answers 2


provide a copy of the GPL license

You not only need to provide a copy of the GNU GPL, but you also need to release the internal application under the GNU GPL.

There is a small chance of compatibility issues between different versions of the GPL and LGPL that you should consider as well.


This is not the case if you use PySide instead of PyQt. PySide uses LGPL so your Python code can be whatever license you want.

From PyQt5 vs PySide2: What's the difference between the two Python Qt libraries?:

The key difference in the two versions — in fact the entire reason PySide2 exists — is licensing. PyQt5 is available under a GPL or commercial license, and PySide2 under a LGPL license.

If you are planning to release your software itself under the GPL, or you are developing software which will not be distributed, the GPL requirement of PyQt5 is unlikely to be an issue. However, if you plan to distribute your software without distributing the source you will either need to purchase a commercial license from Riverbank for PyQt5 or use PySide2.

The LGPL license does not require you to share the source code of your own applications, even if they are bundled with PySide2.

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