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Thread: can i develope commercial desktop app with qt4.5 lgpl version?

  1. #1
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    Question can i develope commercial desktop app with qt4.5 lgpl version?

    Hi....,
    Sorry for asking such stupid question. In fact i was confused with lgpl licensing..
    I want to develop a commercial application(closed source) in windows with qt framework.
    My requirements are :
    1)My application should be commercial and closed source
    2)My customers will pay fee to me for using my qt desktop application.
    3)I want to use qt 4.5 LGPL windows version for developement.
    My Questions are :
    1)Can i develop such software by using qt lgpl version?
    2)Or should i pay a licensing fee to nokia?
    3)Will my customers have to pay fee to nokia for using qt runtime libraries.
    4)Is there any best solution which requires my criterea (developing commertial app without paying license fee)

    FYI: 1)I wont modify any qt libraries(simply i use them thats it)
    2)I want to use 2 physical mediums(cd/dvd) for both my app and qt run time libraries for windows. One cd containd my application's .exe file , another cd conatins qt run libraries without modification.
    3)I feel logically i am charging my customers for selling my qt app, not for distributing qt runtime by using two physical mediums.

    Correct me if i asked question in a wrong way..I hope you understood my thought.
    Advance thanks for your patience.

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    Default Re: can i develope commercial desktop app with qt4.5 lgpl version?

    Short: You can use LGPL.

    • You have to link the Qt libraries dynamically
    • You have to say, that you use Qt under LGPL everywhere you have a copy notice in your app and also there must be a "README" on your cd
    • You don't have to use two cds, you can put all on one.
    • If you earn a lot of money with your application, by a commercial license to pay tribute to the grate work of Qt!


    But consider, I'm not a lawer...

    EDIT:
    3)Will my customers have to pay fee to nokia for using qt runtime libraries.
    no!

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    Default Re: can i develope commercial desktop app with qt4.5 lgpl version?

    Thank you very much, but still some confusion....
    Answers with more elaborated way are appreciated.

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    Default Re: can i develope commercial desktop app with qt4.5 lgpl version?

    If you want a more elaborate answer, why don't you just read the LGPL licence text?

    http://www.gnu.org/licenses/lgpl-3.0-standalone.html

    All your questions have already been answered by Lykurg though...
    Your biological and technological distinctiveness will be added to our own. Resistance is futile.

    Please ask Qt related questions on the forum and not using private messages or visitor messages.


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