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Qt Commercial License Terms, Independent Developers

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  • L luca

    @JonB Thanks for the explanation.
    I would like to pay for a commercial Qt license to thanks for the good works THEY did, but at the moment it cost too much for free projects (non open source).
    The startup plan is not so expensive but it require you to pay forever if you publish your app in an app store.

    I hope Qt will find a good solution for all...

    A Offline
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    ambershark
    wrote on last edited by
    #22

    @luca

    I hope Qt will find a good solution for all...

    They did, LGPL. :) You can use that with a closed source free application on a web store as long as you link dynamically and Qt can be replaced easily with a version built elsewhere.

    Since you can now link dynamically on both iOS and android you should have no issues using the LGPL license for Qt. LGPL was made for your exact use case.

    Disclaimer: IANAL make sure to check with a lawyer.

    My L-GPL'd C++ Logger github.com/ambershark-mike/sharklog

    JonBJ 1 Reply Last reply
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    • A ambershark

      @luca

      I hope Qt will find a good solution for all...

      They did, LGPL. :) You can use that with a closed source free application on a web store as long as you link dynamically and Qt can be replaced easily with a version built elsewhere.

      Since you can now link dynamically on both iOS and android you should have no issues using the LGPL license for Qt. LGPL was made for your exact use case.

      Disclaimer: IANAL make sure to check with a lawyer.

      JonBJ Offline
      JonBJ Offline
      JonB
      wrote on last edited by
      #23

      @ambershark said in Qt Commercial License Terms, Independent Developers:

      Since you can now link dynamically on both iOS and android

      Ah, right, is that what I was thinking I recalled when I wrote

      I think it used to require static linking maybe, but not now

      ? Have they made it so you can now but didn't used to be able to? OOI, is that a change at the Android side or the Qt side to make it possible?

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        luca
        wrote on last edited by
        #24

        Where can I find a list of LGPL Qt modules for a specific release of Qt ?

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        • JonBJ JonB

          @ambershark said in Qt Commercial License Terms, Independent Developers:

          Since you can now link dynamically on both iOS and android

          Ah, right, is that what I was thinking I recalled when I wrote

          I think it used to require static linking maybe, but not now

          ? Have they made it so you can now but didn't used to be able to? OOI, is that a change at the Android side or the Qt side to make it possible?

          A Offline
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          ambershark
          wrote on last edited by
          #25

          @JonB Pretty sure android always supported dynamic linking, although I could be wrong here, I'm not really a mobile developer. I've done one back end library on mobile and that was it.

          It was iOS that used to be static only and change to allow dynamic linking recently (like last year or 2).

          My L-GPL'd C++ Logger github.com/ambershark-mike/sharklog

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            Cheng shi hua
            wrote on last edited by
            #26

            I am an independent game author. If I use LGPL, develop a library that uses QML and dynamically links QT, and then publish it to steam, do I need to pay QT or open source?

            jsulmJ 1 Reply Last reply
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            • C Cheng shi hua

              I am an independent game author. If I use LGPL, develop a library that uses QML and dynamically links QT, and then publish it to steam, do I need to pay QT or open source?

              jsulmJ Offline
              jsulmJ Offline
              jsulm
              Lifetime Qt Champion
              wrote on last edited by
              #27

              @Cheng-shi-hua said in Qt Commercial License Terms, Independent Developers:

              do I need to pay QT or open source?

              No, as long as you can fulfill LGPL3 you do not need commercial license and do not have to open your source code.
              LGPL3 requires you to provide users the possibility to replace Qt libraries with their own versions. This usually requires you to provide object files (.o), so users can relink. And it is not possible when using static Qt libraries!

              Keep in mind people here (me included) are not lawyers!

              https://forum.qt.io/topic/113070/qt-code-of-conduct

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                Cheng shi hua
                wrote on last edited by
                #28

                No QT official came out to clarify? This matter is important

                jsulmJ 1 Reply Last reply
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                • C Cheng shi hua

                  No QT official came out to clarify? This matter is important

                  jsulmJ Offline
                  jsulmJ Offline
                  jsulm
                  Lifetime Qt Champion
                  wrote on last edited by
                  #29

                  @Cheng-shi-hua This forum is for Qt users and not "Qt officials". If you want an answer from Qt officials then pleas ask Qt Company.

                  https://forum.qt.io/topic/113070/qt-code-of-conduct

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                  • C Offline
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                    Cheng shi hua
                    wrote on last edited by
                    #30

                    This is the case, thank you very much. Since it is a community, you can advertise here when I develop a game :)

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                      LarryCox
                      Banned
                      wrote on last edited by
                      #31
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                        ThomasGrace123
                        Banned
                        wrote on last edited by
                        #32
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                        • T ThomasGrace123

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                          vosob80267
                          Banned
                          wrote on last edited by vosob80267
                          #33
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                            JamesPalmer
                            Banned
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                            #34
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                              Betty R. Harris
                              Banned
                              wrote on last edited by Betty R. Harris
                              #35
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