Usually, not. When using the commercially licensed version of Qt, we provide almost all of Qt under a commercial license terms.
A few modules in Qt use code from 3rd party open source components such as the Qt WebEngine is using the Chromiun licensed under LGPLv2.1, or Qt Multimedia using the FFmpeg also licensed under LGPLv2.1. When using these modules, you either need to replace the 3rd party modules with your own code or fulfill the corresponding license obligations for that part of your solution, in case of Chromium or FFmpeg the LGPLv2.1.
All 3rd party modules and dependencies in different Qt modules are documented under Qt Documentation . The list may vary between each Qt release.
