Results 1 to 4 of 4

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

  1. #1
    Join Date
    Oct 2009
    Posts
    19
    Thanks
    2
    Qt products
    Qt4
    Platforms
    Unix/X11 Windows

    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.

  2. #2
    Join Date
    Jan 2006
    Location
    Germany
    Posts
    4,380
    Thanks
    19
    Thanked 1,005 Times in 913 Posts
    Qt products
    Qt4
    Platforms
    Unix/X11 Windows Symbian S60
    Wiki edits
    5

    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!

  3. #3
    Join Date
    Oct 2009
    Posts
    19
    Thanks
    2
    Qt products
    Qt4
    Platforms
    Unix/X11 Windows

    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.

  4. #4
    Join Date
    Jan 2006
    Location
    Warsaw, Poland
    Posts
    33,363
    Thanks
    3
    Thanked 5,012 Times in 4,791 Posts
    Qt products
    Qt3 Qt4 Qt5 Qt/Embedded
    Platforms
    Unix/X11 Windows Android Maemo/MeeGo
    Wiki edits
    10

    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.


Similar Threads

  1. Application deployment on Mac OS X (10.5)
    By ghorwin in forum Installation and Deployment
    Replies: 1
    Last Post: 11th March 2010, 15:38
  2. how to install LGPL version of Qt?
    By rajesh in forum Installation and Deployment
    Replies: 11
    Last Post: 22nd May 2009, 11:15
  3. Qt designer plugin errors on OSX Leopard
    By mpotocnik in forum Qt Tools
    Replies: 10
    Last Post: 21st January 2008, 10:45
  4. Distributing QT application for Mac OS
    By mb0 in forum Qt Programming
    Replies: 1
    Last Post: 31st May 2007, 19:59
  5. Replies: 15
    Last Post: 21st April 2007, 18:46

Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Digia, Qt and their respective logos are trademarks of Digia Plc in Finland and/or other countries worldwide.