Jan 132016
 

The Qt Company has announced changes to the open source licensing and
product structure of the Qt cross-platform application development
framework. “New versions of Qt will be licensed under a commercial license, GPLv2, GPLv3, and LGPLv3, but no longer under LGPLv2.1. The updated open source licenses better ensure end user freedom when using open source licensed versions of Qt. LGPLv3 explicitly forbids the distribution of closed embedded devices. Distributing software under these terms includes a patent grant to all receivers of the software. Commercial Qt licensing removes these requirements and includes professional technical support from The Qt Company.
Qt open source licensing changed
Source: LWN.Net