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About Desktop Commercial Licence

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  • B Offline
    B Offline
    biomed12
    wrote on last edited by
    #1

    Hello dear all,

    I wanna write a desktop app which communicates with a PCB board. The PCB will be a commercial product. But, I wanna give the desktop app freely.

    I have a few questions.

    1-) Do I need to buy a commercial licence for this desktop app?
    2-) If the 1 is necessary, I wanna start with open-source qt and switch to commercial version when the project growth. Is it possible?
    3-) How the Qt company determines if the app is written with commercial version of Qt? Because, dynamic linking is possible also for open source version.

    Thanks.

    **Please do not give LGPL page links, I do not understand that damn papers.
    **Please do not give advice like "write to Qt directly". I have written 2 days ago but there is no response yet.

    raven-worxR 1 Reply Last reply
    0
    • B biomed12

      Hello dear all,

      I wanna write a desktop app which communicates with a PCB board. The PCB will be a commercial product. But, I wanna give the desktop app freely.

      I have a few questions.

      1-) Do I need to buy a commercial licence for this desktop app?
      2-) If the 1 is necessary, I wanna start with open-source qt and switch to commercial version when the project growth. Is it possible?
      3-) How the Qt company determines if the app is written with commercial version of Qt? Because, dynamic linking is possible also for open source version.

      Thanks.

      **Please do not give LGPL page links, I do not understand that damn papers.
      **Please do not give advice like "write to Qt directly". I have written 2 days ago but there is no response yet.

      raven-worxR Offline
      raven-worxR Offline
      raven-worx
      Moderators
      wrote on last edited by raven-worx
      #2

      @biomed12 said in About Desktop Commercial Licence:

      1-) Do I need to buy a commercial licence for this desktop app?

      If you do make any changes to the Qt source code nor statically link against Qt, you can develop with the open source license (LGPL).
      So use the unmodified Qt dlls/libs and you are good to go

      2-) If the 1 is necessary, I wanna start with open-source qt and switch to commercial version when the project growth. Is it possible?

      Thats sometimes hard to prove when development really starts, but they do want you to take the full license already in development phase.

      --- SUPPORT REQUESTS VIA CHAT WILL BE IGNORED ---
      If you have a question please use the forum so others can benefit from the solution in the future

      B 1 Reply Last reply
      0
      • raven-worxR raven-worx

        @biomed12 said in About Desktop Commercial Licence:

        1-) Do I need to buy a commercial licence for this desktop app?

        If you do make any changes to the Qt source code nor statically link against Qt, you can develop with the open source license (LGPL).
        So use the unmodified Qt dlls/libs and you are good to go

        2-) If the 1 is necessary, I wanna start with open-source qt and switch to commercial version when the project growth. Is it possible?

        Thats sometimes hard to prove when development really starts, but they do want you to take the full license already in development phase.

        B Offline
        B Offline
        biomed12
        wrote on last edited by
        #3

        @raven-worx

        No, The application just will be simple application for some simple task. Also, I will not chance any source code of QT, I will use as it is.

        Thanks for reply.

        1 Reply Last reply
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