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<div class="breadcrumb"><a href="/">Home</a> » <a href="/licenses">Licenses</a></div>

<h1 property="dc:title">Independent JPEG Group License</h1>

<h2 style="color: #003F69;">Full name</h2>
    <div property="rdfs:label"><p style="margin-left: 20px;">Independent JPEG Group License</p></div>

<h2 style="color: #003F69;">Short identifier</h2>
    <p style="margin-left: 20px;"><code property="spdx:licenseId">IJG</code></p>

<h2 style="color: #003F69;">Other web pages for this license</h2>
    <p style="margin-left: 20px;">				<li><a href="http://dev.w3.org/cvsweb/Amaya/libjpeg/Attic/README?rev=1.2" rel="owl:sameAs">http://dev.w3.org/cvsweb/Amaya/libjpeg/Attic/README?rev=1.2</a></li>

</p>

<h2 style="color: #003F69;" id="notes">Notes</h2>
    <p style="margin-left: 20px;">None</p>

<h2 style="color: #003F69;" id="licenseText">Text</h2>

<div property="spdx:licenseText" class="license-text">
Independent JPEG Group License
<p>
<br/>
LEGAL ISSUES
<br/>
============
</p>
<p>In plain English:
</p>
<p>1. We don&apos;t promise that this software works.  (But if you find any bugs,
<br/>
   please let us know!)
<br/>
2. You can use this software for whatever you want.  You don&apos;t have to pay us.
<br/>
3. You may not pretend that you wrote this software.  If you use it in a
<br/>
   program, you must acknowledge somewhere in your documentation that
<br/>
   you&apos;ve used the IJG code.
</p>
<p>In legalese:
</p>
<p>The authors make NO WARRANTY or representation, either express or implied,
<br/>
with respect to this software, its quality, accuracy, merchantability, or
<br/>
fitness for a particular purpose.  This software is provided &quot;AS IS&quot;, and you,
<br/>
its user, assume the entire risk as to its quality and accuracy.
</p>
<p>This software is copyright (C) 1991-1998, Thomas G. Lane.
<br/>
All Rights Reserved except as specified below.
</p>
<p>Permission is hereby granted to use, copy, modify, and distribute this
<br/>
software (or portions thereof) for any purpose, without fee, subject to these
<br/>
conditions:
<br/>
(1) If any part of the source code for this software is distributed, then this
<br/>
README file must be included, with this copyright and no-warranty notice
<br/>
unaltered; and any additions, deletions, or changes to the original files
<br/>
must be clearly indicated in accompanying documentation.
<br/>
(2) If only executable code is distributed, then the accompanying
<br/>
documentation must state that &quot;this software is based in part on the work of
<br/>
the Independent JPEG Group&quot;.
<br/>
(3) Permission for use of this software is granted only if the user accepts
<br/>
full responsibility for any undesirable consequences; the authors accept
<br/>
NO LIABILITY for damages of any kind.
</p>
<p>These conditions apply to any software derived from or based on the IJG code,
<br/>
not just to the unmodified library.  If you use our work, you ought to
<br/>
acknowledge us.
</p>
<p>Permission is NOT granted for the use of any IJG author&apos;s name or company name
<br/>
in advertising or publicity relating to this software or products derived from
<br/>
it.  This software may be referred to only as &quot;the Independent JPEG Group&apos;s
<br/>
software&quot;.
</p>
<p>We specifically permit and encourage the use of this software as the basis of
<br/>
commercial products, provided that all warranty or liability claims are
<br/>
assumed by the product vendor.
</p>
<p>
<br/>
ansi2knr.c is included in this distribution by permission of L. Peter Deutsch,
<br/>
sole proprietor of its copyright holder, Aladdin Enterprises of Menlo Park, CA.
<br/>
ansi2knr.c is NOT covered by the above copyright and conditions, but instead
<br/>
by the usual distribution terms of the Free Software Foundation; principally,
<br/>
that you must include source code if you redistribute it.  (See the file
<br/>
ansi2knr.c for full details.)  However, since ansi2knr.c is not needed as part
<br/>
of any program generated from the IJG code, this does not limit you more than
<br/>
the foregoing paragraphs do.
</p>
<p>The Unix configuration script &quot;configure&quot; was produced with GNU Autoconf.
<br/>
It is copyright by the Free Software Foundation but is freely distributable.
<br/>
The same holds for its supporting scripts (config.guess, config.sub,
<br/>
ltconfig, ltmain.sh).  Another support script, install-sh, is copyright
<br/>
by M.I.T. but is also freely distributable.
</p>
<p>It appears that the arithmetic coding option of the JPEG spec is covered by
<br/>
patents owned by IBM, AT&amp;T, and Mitsubishi.  Hence arithmetic coding cannot
<br/>
legally be used without obtaining one or more licenses.  For this reason,
<br/>
support for arithmetic coding has been removed from the free JPEG software.
<br/>
(Since arithmetic coding provides only a marginal gain over the unpatented
<br/>
Huffman mode, it is unlikely that very many implementations will support it.)
<br/>
So far as we are aware, there are no patent restrictions on the remaining
<br/>
code.
</p>
<p>The IJG distribution formerly included code to read and write GIF files.
<br/>
To avoid entanglement with the Unisys LZW patent, GIF reading support has
<br/>
been removed altogether, and the GIF writer has been simplified to produce
<br/>
&quot;uncompressed GIFs&quot;.  This technique does not use the LZW algorithm; the
<br/>
resulting GIF files are larger than usual, but are readable by all standard
<br/>
GIF decoders.
</p>
<p>We are required to state that
<br/>
    &quot;The Graphics Interchange Format(c) is the Copyright property of
<br/>
    CompuServe Incorporated.  GIF(sm) is a Service Mark property of
<br/>
    CompuServe Incorporated.&quot;</p>
</div>

<h2 style="color: #003F69;"  id="licenseText">Standard License Header</h2>
<div property="spdx:standardLicenseHeader" class="license-text"></div>

<!--
<h2 style="color: #003F69;"  id=standardLicenseTemplate>License Template</h2>
<div property="spdx:licenseTemplate" class="license-template">Independent JPEG Group License
<p>
<br/>
LEGAL ISSUES
<br/>
============
</p>
<p>In plain English:
</p>
<p>1. We don&apos;t promise that this software works.  (But if you find any bugs,
<br/>
   please let us know!)
<br/>
2. You can use this software for whatever you want.  You don&apos;t have to pay us.
<br/>
3. You may not pretend that you wrote this software.  If you use it in a
<br/>
   program, you must acknowledge somewhere in your documentation that
<br/>
   you&apos;ve used the IJG code.
</p>
<p>In legalese:
</p>
<p>The authors make NO WARRANTY or representation, either express or implied,
<br/>
with respect to this software, its quality, accuracy, merchantability, or
<br/>
fitness for a particular purpose.  This software is provided &quot;AS IS&quot;, and you,
<br/>
its user, assume the entire risk as to its quality and accuracy.
</p>
<p>This software is copyright (C) 1991-1998, Thomas G. Lane.
<br/>
All Rights Reserved except as specified below.
</p>
<p>Permission is hereby granted to use, copy, modify, and distribute this
<br/>
software (or portions thereof) for any purpose, without fee, subject to these
<br/>
conditions:
<br/>
(1) If any part of the source code for this software is distributed, then this
<br/>
README file must be included, with this copyright and no-warranty notice
<br/>
unaltered; and any additions, deletions, or changes to the original files
<br/>
must be clearly indicated in accompanying documentation.
<br/>
(2) If only executable code is distributed, then the accompanying
<br/>
documentation must state that &quot;this software is based in part on the work of
<br/>
the Independent JPEG Group&quot;.
<br/>
(3) Permission for use of this software is granted only if the user accepts
<br/>
full responsibility for any undesirable consequences; the authors accept
<br/>
NO LIABILITY for damages of any kind.
</p>
<p>These conditions apply to any software derived from or based on the IJG code,
<br/>
not just to the unmodified library.  If you use our work, you ought to
<br/>
acknowledge us.
</p>
<p>Permission is NOT granted for the use of any IJG author&apos;s name or company name
<br/>
in advertising or publicity relating to this software or products derived from
<br/>
it.  This software may be referred to only as &quot;the Independent JPEG Group&apos;s
<br/>
software&quot;.
</p>
<p>We specifically permit and encourage the use of this software as the basis of
<br/>
commercial products, provided that all warranty or liability claims are
<br/>
assumed by the product vendor.
</p>
<p>
<br/>
ansi2knr.c is included in this distribution by permission of L. Peter Deutsch,
<br/>
sole proprietor of its copyright holder, Aladdin Enterprises of Menlo Park, CA.
<br/>
ansi2knr.c is NOT covered by the above copyright and conditions, but instead
<br/>
by the usual distribution terms of the Free Software Foundation; principally,
<br/>
that you must include source code if you redistribute it.  (See the file
<br/>
ansi2knr.c for full details.)  However, since ansi2knr.c is not needed as part
<br/>
of any program generated from the IJG code, this does not limit you more than
<br/>
the foregoing paragraphs do.
</p>
<p>The Unix configuration script &quot;configure&quot; was produced with GNU Autoconf.
<br/>
It is copyright by the Free Software Foundation but is freely distributable.
<br/>
The same holds for its supporting scripts (config.guess, config.sub,
<br/>
ltconfig, ltmain.sh).  Another support script, install-sh, is copyright
<br/>
by M.I.T. but is also freely distributable.
</p>
<p>It appears that the arithmetic coding option of the JPEG spec is covered by
<br/>
patents owned by IBM, AT&amp;T, and Mitsubishi.  Hence arithmetic coding cannot
<br/>
legally be used without obtaining one or more licenses.  For this reason,
<br/>
support for arithmetic coding has been removed from the free JPEG software.
<br/>
(Since arithmetic coding provides only a marginal gain over the unpatented
<br/>
Huffman mode, it is unlikely that very many implementations will support it.)
<br/>
So far as we are aware, there are no patent restrictions on the remaining
<br/>
code.
</p>
<p>The IJG distribution formerly included code to read and write GIF files.
<br/>
To avoid entanglement with the Unisys LZW patent, GIF reading support has
<br/>
been removed altogether, and the GIF writer has been simplified to produce
<br/>
&quot;uncompressed GIFs&quot;.  This technique does not use the LZW algorithm; the
<br/>
resulting GIF files are larger than usual, but are readable by all standard
<br/>
GIF decoders.
</p>
<p>We are required to state that
<br/>
    &quot;The Graphics Interchange Format(c) is the Copyright property of
<br/>
    CompuServe Incorporated.  GIF(sm) is a Service Mark property of
<br/>
    CompuServe Incorporated.&quot;</p></div> -->

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