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  4. [SOLVED]Freely distribute the Qt shared libraries (DLLs)?
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[SOLVED]Freely distribute the Qt shared libraries (DLLs)?

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  • L Offline
    L Offline
    Loaden
    wrote on last edited by
    #3

    Thanks for reply!
    The key point is: Can I freely distribute the Qt shared libraries (DLLs)?

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    • M Offline
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      mbroadst
      wrote on last edited by
      #4

      Yes, you can.

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      • S Offline
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        stukdev
        wrote on last edited by
        #5

        Yes, you can. And if i understand i have to provide a way to update the library if the user want this, right?

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        • D Offline
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          dangelog
          wrote on last edited by
          #6

          ... which you already do by using dynamic linking: the user will just have to drop in the replacements.

          Software Engineer
          KDAB (UK) Ltd., a KDAB Group company

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            stukdev
            wrote on last edited by
            #7

            Yes, but some user don't know this simple procedure and i have to write a minimal guide for this.
            User != technician :P

            [quote author="peppe" date="1292403048"]... which you already do by using dynamic linking: the user will just have to drop in the replacements.[/quote]

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              ? This user is from outside of this forum
              Guest
              wrote on last edited by
              #8

              hi loaden, do check this out: "http://blog.qt.nokia.com/2009/11/30/qt-making-the-right-licensing-decision/":http://blog.qt.nokia.com/2009/11/30/qt-making-the-right-licensing-decision/

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              • A Offline
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                andre
                wrote on last edited by
                #9

                [quote author="stuk" date="1292403168"]Yes, but some user don't know this simple procedure and i have to write a minimal guide for this.
                User != technician :P

                [quote author="peppe" date="1292403048"]... which you already do by using dynamic linking: the user will just have to drop in the replacements.[/quote]

                [/quote]
                As far as I know, the LGPL does not require you to explain how to do it. Just to make it possible to do so. I don't think writing a manual that states that you can drop in newer versions of the Qt library files is needed.

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                • D Offline
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                  dangelog
                  wrote on last edited by
                  #10

                  [quote author="stuk" date="1292403168"]Yes, but some user don't know this simple procedure and i have to write a minimal guide for this.
                  User != technician :P

                  [quote author="peppe" date="1292403048"]... which you already do by using dynamic linking: the user will just have to drop in the replacements.[/quote]
                  [/quote]

                  The LGPL doesn't require you to make your users smarter :-)

                  Software Engineer
                  KDAB (UK) Ltd., a KDAB Group company

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                    anselmolsm
                    wrote on last edited by
                    #11

                    This 'allow updates' requirement is a way to guarantee your proprietary application does not depend on modifications you did in the library - it must be possible for the software to be linked with a newer version of the LGPL library (Qt, in this case :-P), not only to your Qt version. So, if you modify Qt (what is not you case, as you said), to respect LGPL you must submit the changes upstream.

                    I'm not a lawyer [1], please correct me if I'm wrong

                    [1] In 100% of the license discussions, someone must say this sentence, at least once =P

                    Anselmo L. S. Melo (anselmolsm)

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                    • L Offline
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                      Loaden
                      wrote on last edited by
                      #12

                      Thanks a lot!!

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                      • D Offline
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                        dangelog
                        wrote on last edited by
                        #13

                        [quote author="anselmolsm" date="1292412214"]I'm not a lawyer [1], please correct me if I'm wrong

                        [1] In 100% of the license discussions, someone must say this sentence, at least once =P[/quote]

                        You're absolutely right. Was thinking if this should be some kind of FAQ: "Never ever ask for legal advice on forums, mailing lists, IRC and whatsoever. Consult an IT lawyer." (?)

                        Software Engineer
                        KDAB (UK) Ltd., a KDAB Group company

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                        • G Offline
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                          goetz
                          wrote on last edited by
                          #14

                          [quote author="peppe" date="1292457362"]You're absolutely right. Was thinking if this should be some kind of FAQ: "Never ever ask for legal advice on forums, mailing lists, IRC and whatsoever. Consult an IT lawyer." (?)
                          [/quote]

                          That might not help either. If you ask three of these guys you will get four opinions....

                          http://www.catb.org/~esr/faqs/smart-questions.html

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                            dangelog
                            wrote on last edited by
                            #15

                            [quote author="Volker" date="1292492418"][quote author="peppe" date="1292457362"]You're absolutely right. Was thinking if this should be some kind of FAQ: "Never ever ask for legal advice on forums, mailing lists, IRC and whatsoever. Consult an IT lawyer." (?)
                            [/quote]

                            That might not help either. If you ask three of these guys you will get four opinions....[/quote]

                            Haha, ok, point taken, but at least they're supposed to know the matter and you sign agreements with them, whilst on forums you have no guarantees whatsoever.

                            Software Engineer
                            KDAB (UK) Ltd., a KDAB Group company

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                              goetz
                              wrote on last edited by
                              #16

                              [quote author="peppe" date="1292493548]Haha, ok, point taken, but at least they're supposed to know the matter and you sign agreements with them, whilst on forums you have no guarantees whatsoever.[/quote]

                              That's true. It's in most cases better to ask a specialized lawyer than a forum with all that "I believe that..." answers.

                              http://www.catb.org/~esr/faqs/smart-questions.html

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                                giesbert
                                wrote on last edited by
                                #17

                                But if you ask 3 lawyers, you perhaps get also 4 answers.
                                Perhaps the Trolls can make a definite statement? That could then also be put to FAQ?

                                Nokia Certified Qt Specialist.
                                Programming Is Like Sex: One mistake and you have to support it for the rest of your life. (Michael Sinz)

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                                • L Offline
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                                  Loaden
                                  wrote on last edited by
                                  #18

                                  Hi, All, Another question that is can i distribute all files (e.g. my apps, Qt DLLs) use one package (e.g. one NSIS install package, or one zip/7z/tar.gz package) ?
                                  Many thanks!

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                                  • A Offline
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                                    andre
                                    wrote on last edited by
                                    #19

                                    Sure you can*!

                                    *) Opinion of a non-lawer.

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                                    • L Offline
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                                      Loaden
                                      wrote on last edited by
                                      #20

                                      Change state to SOLVED.
                                      Thanks all!

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