- Qt 6.11
- Qt GUI
- LibJPEG-turbo, version 3.2.0
- Qt 6.11.2 Reference Documentation

# LibJPEG-turbo, version 3.2.0

The Independent JPEG Group's JPEG software

Used in the qjpeg image plugin. Configure with -system-libjpeg or -no-libjpeg to avoid.

The sources can be found in qtbase-everywhere-src-6.11.2/src/3rdparty/libjpeg.

Project Homepage, upstream version: 3.2.0

     Copyright (C) 2009-2026 D. R. Commander
     Copyright (C) 1991-1998 Thomas G. Lane
     Copyright (C) 2009 Pierre Ossman for Cendio AB
     Copyright (C) 1999-2006 MIYASAKA Masaru
     Copyright (C) 1999 Ken Murchison
     Copyright (C) 2015-2016, 2018, 2022 Matthieu Darbois
     Copyright (C) 2018 Matthias Räncker
     Copyright (C) 2019-2020 Arm Limited
     Copyright (C) 2022 Felix Hanau
     Copyright (C) 1997-1998 Thomas G. Lane, Todd Newman
     Copyright (C) 2021 Alex Richardson
     Copyright (C) 2015, 2020 Google, Inc.
     Copyright (C) 2013 Linaro Limited
     Copyright (C) 2014 Olle Liljenzin
     Copyright (C) 1991-2020 Thomas G. Lane, Guido Vollbeding

Independent JPEG Group License and BSD 3-Clause "New" or "Revised" License.

     libjpeg-turbo Licenses
     ======================

     libjpeg-turbo is covered by two compatible BSD-style open source licenses:

     - The IJG (Independent JPEG Group) License, which is listed in
       [README.ijg](README.ijg)

       This license applies to the libjpeg API library and associated programs,
       including any code inherited from libjpeg and any modifications to that
       code.

     - The Modified (3-clause) BSD License, which is listed below

       This license applies to the TurboJPEG API library and associated programs,
       [libspng](https://libspng.org) (which is used by cjpeg and djpeg), and the
       build/test system.

       * The TurboJPEG API library wraps the libjpeg API library, so in the context
         of the overall TurboJPEG API library, both the terms of the IJG License and
         the terms of the Modified (3-clause) BSD License apply.
       * cjpeg and djpeg use libspng, so in the context of those programs, both the
         terms of the IJG License and the terms of the Modified (3-clause) BSD
         License apply.

     Component Licenses
     ==================

     Some of libjpeg-turbo's modules and internal dependencies are covered by less
     restrictive licenses, but in the context of libjpeg-turbo as a whole, the terms
     of the less restrictive licenses are subsumed by either the IJG License or the
     Modified BSD License.  (In other words, the terms of the less restrictive
     licenses are satisfied if the terms of the IJG and Modified BSD Licenses are
     satisfied.)

     - The libjpeg-turbo SIMD source code and zlib are covered by the
       [zlib License](https://spdx.org/licenses/Zlib.html), which is subsumed by the
       IJG License in the context of the cjpeg and djpeg programs and the libjpeg
       API library.

     - Some of the libspng source code is covered by the
       [PNG Reference Library License v2](https://spdx.org/licenses/libpng-2.0.html),
       which is subsumed by the IJG License in the context of the cjpeg and djpeg
       programs and the TurboJPEG API library.

     - Most of the libspng source code is covered by the
       [Simplified (2-clause) BSD License](https://spdx.org/licenses/BSD-2-Clause.html),
       which is subsumed by the Modified BSD License in the context of the cjpeg and
       djpeg programs and the TurboJPEG API library.

     Complying with the libjpeg-turbo Licenses
     =========================================

     This section provides a roll-up of the libjpeg-turbo licensing terms, to the
     best of our understanding.  This is not a license in and of itself.  It is
     intended solely for clarification.

     1.  If you are distributing a modified version of the libjpeg-turbo source,
         then:

         1.  You cannot alter or remove any existing copyright or license notices
             from the source.

             **Origin**
             - Clause 1 of the IJG License
             - Clause 1 of the Modified BSD License

         2.  You must add your own copyright notice to the header of each source
             file you modified, so others can tell that you modified that file.  (If
             there is not an existing copyright header in that file, then you can
             simply add a notice stating that you modified the file.)

             **Origin**
             - Clause 1 of the IJG License

         3.  You must include the IJG README file, and you must not alter any of the
             copyright or license text in that file.

             **Origin**
             - Clause 1 of the IJG License

     2.  If you are distributing only libjpeg-turbo binaries without the source, or
         if you are distributing an application that statically links with
         libjpeg-turbo, then:

         1.  Your product documentation must include a message stating:

             This software is based in part on the work of the Independent JPEG
             Group.

             **Origin**
             - Clause 2 of the IJG license

         2.  If your binary distribution includes or uses the TurboJPEG API or
             associated programs, cjpeg, or djpeg, then your product documentation
             must include the text of the Modified BSD License (see below.)

             **Origin**
             - Clause 2 of the Modified BSD License

     3.  You cannot use the name of the IJG or The libjpeg-turbo Project or the
         contributors thereof in advertising, publicity, etc.

         **Origin**
         - IJG License
         - Clause 3 of the Modified BSD License

     4.  The authors and distributors do not warrant libjpeg-turbo to be free of
         defects, nor do we accept any liability for undesirable consequences
         resulting from your use of the software.

         **Origin**
         - IJG License
         - Modified BSD License

     The Modified (3-clause) BSD License
     ===================================

     Copyright (C) 2009-2026 D. R. Commander<br>
     Copyright (C) 2018-2023 Randy <randy408@protonmail.com>

     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 the libjpeg-turbo Project 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 HOLDERS 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.

     The authors make NO WARRANTY or representation, either express or implied,
     with respect to this software, its quality, accuracy, merchantability, or
     fitness for a particular purpose.  This software is provided "AS IS", and you,
     its user, assume the entire risk as to its quality and accuracy.

     This software is copyright (C) 1991-2020, Thomas G. Lane, Guido Vollbeding.
     All Rights Reserved except as specified below.

     Permission is hereby granted to use, copy, modify, and distribute this
     software (or portions thereof) for any purpose, without fee, subject to these
     conditions:
     (1) If any part of the source code for this software is distributed, then this
     README file must be included, with this copyright and no-warranty notice
     unaltered; and any additions, deletions, or changes to the original files
     must be clearly indicated in accompanying documentation.
     (2) If only executable code is distributed, then the accompanying
     documentation must state that "this software is based in part on the work of
     the Independent JPEG Group".
     (3) Permission for use of this software is granted only if the user accepts
     full responsibility for any undesirable consequences; the authors accept
     NO LIABILITY for damages of any kind.

     These conditions apply to any software derived from or based on the IJG code,
     not just to the unmodified library.  If you use our work, you ought to
     acknowledge us.

     Permission is NOT granted for the use of any IJG author's name or company name
     in advertising or publicity relating to this software or products derived from
     it.  This software may be referred to only as "the Independent JPEG Group's
     software".

     We specifically permit and encourage the use of this software as the basis of
     commercial products, provided that all warranty or liability claims are
     assumed by the product vendor.