On 10/14/2016 08:28 AM, Mehmet Erol Sanliturk via Lazarus wrote:

I consider QT a very big trap . Please be careful about its license if
you want to develop commercial software and also if you want to teach
computer programming to the students that they will work for commercial
companies .

I am seeing many student projects in , especially , Github , which I
consider a total disaster for the students because over time , when they
start as a worker in a commercial company , they will not be able to use
their knowledge if the company does not buy a commercial license from QT
owner .

Trap is the following : QT is using LGPLv2 license in some parts . This
seems to be a good choice , BUT , the same sources are using in some
parts LGPLv3 ( Three ) license . Since software is developed or
contributions accepted by QT owner , this LGPLv3 license is NOT
compulsory , means they can have it LGPLv2 license .  Really , I
consider GPLv3/LGPLv3 licenses not suitable for a service to humanity as
a whole because they are very hostile to commercial companies . If any
LGPLv3 part is used , is only a disaster for all of the other software .
In QT , this fact is a seemingly hidden trap .

AFAIK, LGPLv3 is applied only to Qt extra modules (like QVirtualKeyboard etc), but not to the core lib which is LGPLv2, and we are using core/gui lib only for lazarus, so no problems with commercial usage.


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