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

      <h1 property="dc:title">Mackerras 3-Clause - acknowledgment variant</h1>
      <div style="display:none;"><code property="spdx:deprecated">false</code></div>
      <h2>Full name</h2>
          <p style="margin-left: 20px;"><code property="spdx:name">Mackerras 3-Clause - acknowledgment variant</code></p>

      <h2>Short identifier</h2>
          <p style="margin-left: 20px;"><code property="spdx:licenseId">Mackerras-3-Clause-acknowledgment</code></p>

      <h2>Other web pages for this license</h2>
          <div style="margin-left: 20px;">
            <ul>
             <li>
               <a href="https://github.com/ppp-project/ppp/blob/master/pppd/auth.c#L6-L28" rel="rdfs:seeAlso" isValid=true isLive=true isWayBackLink=false match=false timestamp=2025-07-01T14:59:19Z>https://github.com/ppp-project/ppp/blob/master/pppd/auth.c#L6-L28</a>
               <!--Tentative way of displaying information <p>isValid: true, isLive: true, isWayBackLink: false, match: false, timestamp: 2025-07-01T14:59:19Z</p> -->
             </li>
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      <div property="spdx:isOsiApproved" style="display: none;">false</div>

      <h2 id="notes">Notes</h2>
          <p style="margin-left: 20px;">This is similar to Mackerras-3-Clause, but removes the obligations related to binary distribution and adds an acknowledgement obligation.</p>

      <h2 id="licenseText">Text</h2>
      
      <blockquote cite="https://spdx.github.io/spdx-spec/v2.3/license-matching-guidelines-and-templates/">
          <div style="border: 2px solid grey; padding: 8px">
		      Text in italicized blue is omittable (see <a href="https://spdx.github.io/spdx-spec/v2.3/license-matching-guidelines-and-templates/#b35-guideline-omittable-text">Matching Guidelines B.3.5</a>).
		      License or exception text will match to the text for the specified identifier if it either includes or excludes this omittable text.
			  <br/>
			  <br/>
			  Text in red is replaceable (see <a href="https://spdx.github.io/spdx-spec/v2.3/license-matching-guidelines-and-templates/#b34-guideline-replaceable-text">Matching Guidelines B.3.4</a>).
			  License or exception text will match to the text for the specified identifier if it includes a permitted variant of this replaceable text.
			  The permitted variants can be found in the corresponding regular expression as shown in title text visible by hovering over the red text.
	      </div>
	  </blockquote>

      <div property="spdx:licenseText" class="license-text">
      
         <var class="replaceable-license-text"><span title="can be replaced with the pattern .{0,5000}"> 
            Copyright (c) 1993-2002 Paul Mackerras. All rights reserved.
         </span></var>
         <p>
            Redistribution and use in source and binary
            forms, with or without modification, are permitted
            provided that the following conditions are met:
         </p>

<ul style="list-style:none">
            
<li>
               <var class="replaceable-license-text"><span title="can be replaced with the pattern .{0,20}"> 1.</span></var>
               Redistributions of source code must retain the above copyright
               notice, this list of conditions and the following disclaimer.
            </li>
            
<li>
               <var class="replaceable-license-text"><span title="can be replaced with the pattern .{0,20}"> 2.</span></var>
               The name(s) of the authors of this software must
               not be used to endorse or promote products derived
               from this software without prior written permission.
            </li>
            
<li>
               <var class="replaceable-license-text"><span title="can be replaced with the pattern .{0,20}"> 3.</span></var>
               Redistributions of any form whatsoever must retain the
               following acknowledgment: &quot;This product includes software
               developed by Paul Mackerras <var class="replaceable-license-text"><span title="can be replaced with the pattern (<paulus@ozlabs.org>|<paulus@samba.org>)"> &lt;paulus@ozlabs.org&gt;</span></var>&quot;.
            </li>
         
</ul>
         <p>
            THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO
            THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
            AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
            SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
            RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
            OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
            OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
         </p>

      
      </div>

      <h2  id="licenseHeader">Standard License Header</h2>
      <div property="spdx:standardLicenseHeader" class="license-text">
        <p style="font-style: italic">There is no standard license header for the license</p>
        
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      <div property="spdx:standardLicenseTemplate" style="display: none;">
      &lt;&lt;var;name&#61;&quot;copyright&quot;;original&#61;&quot;Copyright (c) 1993-2002 Paul Mackerras. All rights reserved.&quot;;match&#61;&quot;.{0,5000}&quot;&gt;&gt;&#10;Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:&#10;&#10;   &lt;&lt;var;name&#61;&quot;bullet&quot;;original&#61;&quot;1.&quot;;match&#61;&quot;.{0,20}&quot;&gt;&gt; Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.&#10;   &lt;&lt;var;name&#61;&quot;bullet&quot;;original&#61;&quot;2.&quot;;match&#61;&quot;.{0,20}&quot;&gt;&gt; The name(s) of the authors of this software must not be used to endorse or promote products derived from this software without prior written permission.&#10;   &lt;&lt;var;name&#61;&quot;bullet&quot;;original&#61;&quot;3.&quot;;match&#61;&quot;.{0,20}&quot;&gt;&gt; Redistributions of any form whatsoever must retain the following acknowledgment: &quot;This product includes software developed by Paul Mackerras &lt;&lt;var;name&#61;&quot;emailAddress&quot;;original&#61;&quot;&lt;paulus@ozlabs.org&gt;&quot;;match&#61;&quot;(&lt;paulus@ozlabs.org&gt;|&lt;paulus@samba.org&gt;)&quot;&gt;&gt; &quot;.&#10;THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.&#10;&#10;
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