Don't be. There is legally binding contract that prevents Qt Company from unilaterally changing the licensing deal (until KDE stops using Qt). Qt is a great ex

Don't be. There is legally binding contract that prevents Qt Company from unilaterally changing the licensing deal (until KDE stops using Qt). Qt is a great example of how you can force commercial highly profitable company to develop open source against their will even after it's sold multiple times. Trolltech and KDE jointly formed the foundation to make sure that Qt core stays open source. Licensing agreement has not changed. Qt Company just stopped doing anything not required by the agreement between The KDE Free Qt Foundation and The Qt Company. https://kde.org/community/whatiskde/Software_License_Agreement_2015.pdf https://kde.org/community/whatiskde/Software_License_Agreeme...