[SOLVED] Lisence for open source Qt application?



  • Hi all,
    I have almost finished an application on Qt and i am looking for the appropriate license.
    The problem is that i have not idea of licenses, and i just checked the net but i cant
    exactly understand the differences between them. So i have some questions about
    them and i will appreciate any help.

    My program will be an open source. Also it uses some other programs as system commands
    (and not their source)... Is there any connection of my license with license of these programs
    that my application uses (just as system commands)?

    Also, i thinking of publishing my application starting of a beta greek edition available for
    ubuntu users. And i want to test it for a couple of months (or less) and then to translate it
    in english and modify it for windows. But it will already be an open source...
    Does it means that the english or the windows edition can be published before i do it
    from another developer without even asking me?

    And a last question on this.
    Witch license do you recommend that my application should have?

    Thank you in advance
    Kostis



  • Hi,

    I'll try to answer one question at time

    bq. Is there any connection of my license with license of these programs
    that my application uses (just as system commands)?

    If you launch external programs by "system()/execv()...." or QProcess, you don't have license problem

    bq. Does it means that the english or the windows edition can be published before i do it
    from another developer without even asking me?

    The copyright of code will be forever yours; however other people can use/modify and redistribute your code freely. This is the real meaning of OpenSource.

    bq. Witch license do you recommend that my application should have?

    Using Qt you should choose one from GNU GPLv3 and GNU LGPLv2.1

    HI hope to help you



  • Thank you @mcosta,

    1. yes i use "system" command... glad that i dont have to follow their licence...

    2. This means that i probably have to test my edition with friends only and not to publish
      a beta edition... because this way, it will not last as much as i need to publish my alpha :(
      I will think about it a little bit more... maybe another name of my program is not so
      bud... but i am afraid that it will not be an opensource...

    3)Thank you... this is what i thought too..
    Now i have to check only two of the infinitive license i had found... :)



  • Hi,

    1. Why you don't want publish your code?
      The power of OpenSource is to allow other people to improove and extend your code.
      Also you can publish your code on sourceforge/gitorious/github and so on and ask for help for translating/porting on Windows


  • I am an ubuntu user...
    and i chosed ubuntu for their open source philosophy...

    I want to publish my code and i will do it anyway...

    I am just a little bit confused with the licences just because i want
    to finish my code before someone take the idea and make a better
    program than mine... and sell it instead of offering it as an open source



  • If someone modify your code, he can't "sell" it.
    Once a Program was created with GPL/LGPL license, no one can change license, only you can.

    Little tip. You'll never finish your code
    This means that a program can be forever upgradable



  • Thank you very much @mcosta...

    I will finally use the GNU GPLv3...

    I know no one can change the license of my program,
    i just worry of making his own program on my idea
    before my alpha is ready... and sure, this way he could sell it.

    But it is not a big deal... my program will be finished soon,
    and it will be an open source, so i am not afraid,
    because open source always are better ;)

    Thank you, its SOLVED
    Kostis



  • [quote author="mcosta" date="1367575224"]Little tip. You'll never finish your code
    This means that a program can be forever upgradable[/quote]

    Isn't that the truth! :D



  • [quote author="mcosta" date="1367575224"]
    Little tip. You'll never finish your code
    This means that a program can be forever upgradable

    [/quote]

    Not always the case. Only some programs.

    Anyways, I think it would be better if you read the contents of the GNU GPLv3. You might be mistaken of some things.



  • hi i have a similar problem to your:
    I'm using visual studio express edition and windows SDK compiler
    I'm using an external library with it'own license
    I'm using Qt creator as developing environment
    'm using Also the Qt libraries 4.8.5 non commercial

    So each "tool", i think impose it's own licenses so at the end what i've should do? I want to release my software opensource and free( i think GPLv3 is the right license), i have to include each license in the package?? how i know if some licenses are in contrast. and what about copyright, i have to register the software somewhere to get copyright notice???

    Thanks


  • Moderators

    ceora it's all really rather simple. Visual Studio and Qt Creator are just code editors: they don't impose any licensing on you, ever. I'm not sure about SDK compiler, but it should not cause any problems here, either.

    For Qt (since you don't have the commercial license) your options are: LGPL or GPL. If you choose GPL, your code is required to be GPL, too. If you choose LGPL, your code can have any license (including proprietary, commercial EULAs). In all cases, you need to include the license for Qt with your code - so that users can read about their rights.

    [quote]I’m using an external library with it’own license[/quote]

    Everything now relies on that single library. What is it's license?



  • Hi thanks for the fast answer!!!

    this is the license shipped with the source:

    bq. Open Asset Import Library (assimp)

    Copyright (c) 2006-2012, assimp team
    All rights reserved.

    Redistribution and use of this software in source and binary forms,
    with or without modification, are permitted provided that the
    following conditions are met:

    • Redistributions of source code must retain the above
      copyright notice, this list of conditions and the
      following disclaimer.

    • Redistributions in binary form must reproduce the above
      copyright notice, this list of conditions and the
      following disclaimer in the documentation and/or other
      materials provided with the distribution.

    • Neither the name of the assimp team, nor the names of its
      contributors may be used to endorse or promote products
      derived from this software without specific prior
      written permission of the assimp team.

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
    "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
    A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
    OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
    SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
    LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
    DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
    OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.


    AN EXCEPTION applies to all files in the ./test/models-nonbsd folder.
    These are 3d models for testing purposes, from various free sources
    on the internet. They are - unless otherwise stated - copyright of
    their respective creators, which may impose additional requirements
    on the use of their work. For any of these models, see
    <model-name>.source.txt for more legal information. Contact us if you
    are a copyright holder and believe that we credited you inproperly or
    if you don't want your files to appear in the repository.


    Poly2Tri Copyright (c) 2009-2010, Poly2Tri Contributors
    http://code.google.com/p/poly2tri/

    All rights reserved.
    Redistribution and use in source and binary forms, with or without modification,
    are permitted provided that the following conditions are met:

    • Redistributions of source code must retain the above copyright notice,
      this list of conditions and the following disclaimer.
    • Redistributions in binary form must reproduce the above copyright notice,
      this list of conditions and the following disclaimer in the documentation
      and/or other materials provided with the distribution.
    • Neither the name of Poly2Tri nor the names of its contributors may be
      used to endorse or promote products derived from this software without specific
      prior written permission.

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
    "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
    A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
    CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
    EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
    PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
    PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
    LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
    NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.


  • Moderators

    Looks BSD-ish, and definitely Open. As far as my limited knowledge says, you can use this safely in your app. Happy coding :)



  • Really thanks!!


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