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Thread: Distribution and license LGPL

  1. #1

    Default Distribution and license LGPL


    When we distribute a project that use Qt under LGPL license, do we have to distribute the LGPL license file ( I mean, do we have to display this license in the software directly (for example in an "about" form) or do we have to copy this license during installation (deployement) of the software.

    The LGPL license says under point 6 (Note that I link dynamically to Qt):
    You must give prominent notice with each copy of the work that the
    Library is used in it and that the Library and its use are covered by
    this License. You must supply a copy of this License. If the work
    during execution displays copyright notices, you must include the
    copyright notice for the Library among them, as well as a reference
    directing the user to the copy of this License. Also, you must do one
    of these things:
    b) Use a suitable shared library mechanism for linking with the
    Library. A suitable mechanism is one that (1) uses at run time a
    copy of the library already present on the user's computer system,
    rather than copying library functions into the executable, and (2)
    will operate properly with a modified version of the library, if
    the user installs one, as long as the modified version is
    interface-compatible with the version that the work was made with.
    I do not find this point very clear.

    Thanks in advance for your help
    Best regards

  2. #2
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    Default Re: Distribution and license LGPL

    The license is written in legalese. If you wish to be absolutely clear about it, then you need to speak to a lawyer. We can not give you legal advice here.

    However, what I can tell you is that the LGPL software I have used typically does include the license, and includes something similar to "Parts of this application are released under the LGPL, and come with no warranty, see the license file for further information" in there about dialogs, but of course, I can't tell you if this is right, wrong, or whatever.

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