Applications licenses

[SteMMo]

Hi all,
sorry for my dumb questions but I'm in a trouble to understand the needed licensees.
To maximum simplification:

Case 1
Qt application with widgets and serial port

Case 2
Qt application with QML and serial port.

Both of them are commercial applications without the share of the application code.
Libraries are standard QT 5.15.
Which licenses I need to develop and deploy them?

Thanks!

[JonB]

@SteMMo said in Applications licenses:

Both of them are commercial applications without the share of the application code.

So you need to ask The Qt Company about your commercial licences. This is a user forum.

[jsulm]

@SteMMo As long as you only use LGPL licensed Qt Modules and you do not change Qt code and you do not link Qt libraries statically you do not need commercial license.
But keep in mind: I'm not a lawyer! It is always better to ask a lawyer and/or QtCompany!

[SteMMo]

@jsulm Thanks a lot.
This is also my understanding.
But: what about if the application will run on an embedded board and this board is sold on a vending machine?

[jsulm]

@SteMMo Wheter you ask for money or not does not matter. What matters is whether you fulfill the OSS licenses. There are some things many OSS licenses ask you to do:

• Provide licenses texts in some form, so the user can see which OSS licenses are used
• Give the user possibility to exchange OSS libraries with own versions (this one can be tricky with embedded boards)

If in doubt you should ask a lawyer and/or QtCompany.