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

      <h1 property="dc:title">CMU Mach License</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">CMU Mach License</code></p>

      <h2>Short identifier</h2>
          <p style="margin-left: 20px;"><code property="spdx:licenseId">CMU-Mach</code></p>

      <h2>Other web pages for this license</h2>
          <div style="margin-left: 20px;">
            <ul>
             <li>
               <a href="https://www.cs.cmu.edu/~410/licenses.html" rel="rdfs:seeAlso" isValid=true isLive=true isWayBackLink=false match=false timestamp=2025-07-01T14:55:25Z>https://www.cs.cmu.edu/~410/licenses.html</a>
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      <div property="spdx:isOsiApproved" style="display: none;">false</div>

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

      <h2 id="licenseText">Text</h2>
      
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		      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>).
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			  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>).
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			  The permitted variants can be found in the corresponding regular expression as shown in title text visible by hovering over the red text.
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         <var class="replaceable-license-text"><span title="can be replaced with the pattern .{0,5000}"> 
            Copyright (c) 1991,1990,1989 Carnegie
            Mellon University All Rights Reserved.
         </span></var>
         <p>
            Permission to use, copy, modify and distribute this software and its
            documentation is hereby granted, provided that both the copyright
            notice and this permission notice appear in all copies of the
            software, derivative works or modified versions, and any portions
            thereof, and that both notices appear in supporting documentation.
         </p>

         <p>
            CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS &quot;AS IS&quot;
            CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
            ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
         </p>

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               Carnegie Mellon requests users of this software to return to
            </p>

            <p>
               Software Distribution Coordinator or
               Software.Distribution@CS.CMU.EDU School of Computer
               Science Carnegie Mellon University Pittsburgh PA 15213-3890
            </p>

            <p>
               any improvements or extensions that they make and grant
               Carnegie Mellon the rights to redistribute these changes.
            </p>

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      <h2  id="licenseHeader">Standard License Header</h2>
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      &lt;&lt;var;name&#61;&quot;copyright&quot;;original&#61;&quot;Copyright (c) 1991,1990,1989 Carnegie Mellon University All Rights Reserved.&quot;;match&#61;&quot;.{0,5000}&quot;&gt;&gt;&#10;Permission to use, copy, modify and distribute this software and its documentation is hereby granted, provided that both the copyright notice and this permission notice appear in all copies of the software, derivative works or modified versions, and any portions thereof, and that both notices appear in supporting documentation.&#10;&#10;CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS &quot;AS IS&quot; CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.&#10;&#10;&lt;&lt;beginOptional&gt;&gt;Carnegie Mellon requests users of this software to return to&#10;&#10;Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU School of Computer Science Carnegie Mellon University Pittsburgh PA 15213-3890&#10;&#10;any improvements or extensions that they make and grant Carnegie Mellon the rights to redistribute these changes.&#10;&#10;&lt;&lt;endOptional&gt;&gt;
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