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

      <h1 property="dc:title">NCBI Public Domain Notice</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">NCBI Public Domain Notice</code></p>

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

      <h2>Other web pages for this license</h2>
          <div style="margin-left: 20px;">
            <ul>
             <li>
               <a href="https://github.com/ncbi/sra-tools/blob/e8e5b6af4edc460156ad9ce5902d0779cffbf685/LICENSE" rel="rdfs:seeAlso" isValid=true isLive=true isWayBackLink=false match=false timestamp=2025-07-01T15:05:06Z>https://github.com/ncbi/sra-tools/blob/e8e5b6af4edc460156ad9ce5902d0779cffbf685/LICENSE</a>
               <!--Tentative way of displaying information <p>isValid: true, isLive: true, isWayBackLink: false, match: false, timestamp: 2025-07-01T15:05:06Z</p> -->
             </li>
             <li>
               <a href="https://github.com/ncbi/datasets/blob/0ea4cd16b61e5b799d9cc55aecfa016d6c9bd2bf/LICENSE.md" rel="rdfs:seeAlso" isValid=true isLive=true isWayBackLink=false match=false timestamp=2025-07-01T15:05:05Z>https://github.com/ncbi/datasets/blob/0ea4cd16b61e5b799d9cc55aecfa016d6c9bd2bf/LICENSE.md</a>
               <!--Tentative way of displaying information <p>isValid: true, isLive: true, isWayBackLink: false, match: false, timestamp: 2025-07-01T15:05:05Z</p> -->
             </li>
             <li>
               <a href="https://github.com/ncbi/gprobe/blob/de64d30fee8b4c4013094d7d3139ea89b5dd1ace/LICENSE" rel="rdfs:seeAlso" isValid=true isLive=true isWayBackLink=false match=false timestamp=2025-07-01T15:05:05Z>https://github.com/ncbi/gprobe/blob/de64d30fee8b4c4013094d7d3139ea89b5dd1ace/LICENSE</a>
               <!--Tentative way of displaying information <p>isValid: true, isLive: true, isWayBackLink: false, match: false, timestamp: 2025-07-01T15:05:05Z</p> -->
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             <li>
               <a href="https://github.com/ncbi/egapx/blob/08930b9dec0c69b2d1a05e5153c7b95ef0a3eb0f/LICENSE" rel="rdfs:seeAlso" isValid=true isLive=true isWayBackLink=false match=false timestamp=2025-07-01T15:05:04Z>https://github.com/ncbi/egapx/blob/08930b9dec0c69b2d1a05e5153c7b95ef0a3eb0f/LICENSE</a>
               <!--Tentative way of displaying information <p>isValid: true, isLive: true, isWayBackLink: false, match: false, timestamp: 2025-07-01T15:05:04Z</p> -->
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             <li>
               <a href="https://github.com/ncbi/datasets/blob/master/LICENSE.md" rel="rdfs:seeAlso" isValid=true isLive=true isWayBackLink=false match=false timestamp=2025-07-01T15:05:04Z>https://github.com/ncbi/datasets/blob/master/LICENSE.md</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>
      
      <blockquote cite="https://spdx.github.io/spdx-spec/v2.3/license-matching-guidelines-and-templates/">
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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>).
		      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">
      
         <div class="optional-license-text"> 
            <p>PUBLIC DOMAIN NOTICE<br />
National Center for Biotechnology Information</p>

         </div>
         <p><var class="optional-license-text"> With the exception of certain third-party files summarized below, </var>
            this software<var class="optional-license-text"> /database</var> is a &quot;United States Government Work&quot; under 
            the terms of the United States Copyright Act.  It was written as part of the 
            <var class="replaceable-license-text"><span title="can be replaced with the pattern authors'|author's"> author&apos;s</span></var> official duties as <var class="optional-license-text"> a</var>
            United States Government <var class="replaceable-license-text"><span title="can be replaced with the pattern employees|employee"> employees</span></var> and 
            thus cannot be copyrighted.  
            This software<var class="optional-license-text"> /database</var> is freely available to the public for use. 
            The <var class="replaceable-license-text"><span title="can be replaced with the pattern NLM|National Library of Medicine|National Library of Medicine \(NLM\)"> NLM</span></var> 
            and the U.S. Government have not placed any restriction on its use or reproduction.</p>

         <p>Although all reasonable efforts have been taken to ensure the accuracy and reliability 
            of the software and data, the NLM and the U.S. Government do not and cannot warrant 
            the performance or results that may be obtained by using this software or data. 
           The NLM and the U.S. Government disclaim all warranties, express or implied, including 
            warranties of performance, merchantability or fitness for any particular purpose.</p>

         <p>Please cite <var class="replaceable-license-text"><span title="can be replaced with the pattern the author|the authors|NCBI"> the author</span></var> in 
            any work or product based on this material.</p>

         <div class="optional-license-text"> 
            <p>EXCEPTIONS (in all cases excluding NCBI-written makefiles):</p>

            <p>&lt;list of exceptions&gt;</p>

            <p>Copyright F.A.Q.</p>

            <p>Q. Our product makes use of the NCBI source code, and we made changes and additions to that version of the NCBI code to better fit it to our needs. Can we copyright the code, and how?</p>

            <p>A. You can copyright only the *changes* or the *additions* you made to the NCBI source code. You should identify unambiguously those sections of the code that were modified, e.g. by commenting any changes you made in the code you distribute. Therefore, your license has to make clear to users that your product is a combination of code that is public domain within the U.S. (but may be subject to copyright by the U.S. in foreign countries) and code that has been created or modified by you.</p>

            <p>Q. Can we (re)license all or part of the NCBI source code?</p>

            <p>A. No, you cannot license or relicense the source code written by NCBI since you cannot claim any copyright in the software that was developed at NCBI as a &apos;government work&apos; and consequently is in the public domain within the U.S.</p>

            <p>Q. What if these copyright guidelines are not clear enough or are not applicable to my particular case?</p>

            <p>A. Contact us. Send your questions to &apos;&lt;<var class="replaceable-license-text"><span title="can be replaced with the pattern .+"> email address</span></var>&gt;&apos;.</p>

         </div>
      
      </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>
        
      </div>
      <div property="spdx:standardLicenseTemplate" style="display: none;">
      &lt;&lt;beginOptional&gt;&gt;PUBLIC DOMAIN NOTICE&#10;National Center for Biotechnology Information&#10;&#10;&lt;&lt;endOptional&gt;&gt;&#10;&lt;&lt;beginOptional&gt;&gt;With the exception of certain third-party files summarized below,&lt;&lt;endOptional&gt;&gt; this software&lt;&lt;beginOptional&gt;&gt; /database&lt;&lt;endOptional&gt;&gt; is a &quot;United States Government Work&quot; under the terms of the United States Copyright Act. It was written as part of the &lt;&lt;var;name&#61;&quot;author1&quot;;original&#61;&quot;author&#39;s&quot;;match&#61;&quot;authors&#39;|author&#39;s&quot;&gt;&gt; official duties as&lt;&lt;beginOptional&gt;&gt; a&lt;&lt;endOptional&gt;&gt; United States Government &lt;&lt;var;name&#61;&quot;employee&quot;;original&#61;&quot;employees&quot;;match&#61;&quot;employees|employee&quot;&gt;&gt; and thus cannot be copyrighted. This software&lt;&lt;beginOptional&gt;&gt; /database&lt;&lt;endOptional&gt;&gt; is freely available to the public for use. The &lt;&lt;var;name&#61;&quot;nlm&quot;;original&#61;&quot;NLM&quot;;match&#61;&quot;NLM|National Library of Medicine|National Library of Medicine \(NLM\)&quot;&gt;&gt; and the U.S. Government have not placed any restriction on its use or reproduction.&#10;&#10;Although all reasonable efforts have been taken to ensure the accuracy and reliability of the software and data, the NLM and the U.S. Government do not and cannot warrant the performance or results that may be obtained by using this software or data. The NLM and the U.S. Government disclaim all warranties, express or implied, including warranties of performance, merchantability or fitness for any particular purpose.&#10;&#10;Please cite &lt;&lt;var;name&#61;&quot;authors1&quot;;original&#61;&quot;the author&quot;;match&#61;&quot;the author|the authors|NCBI&quot;&gt;&gt; in any work or product based on this material.&#10;&#10;&lt;&lt;beginOptional&gt;&gt;EXCEPTIONS (in all cases excluding NCBI-written makefiles):&#10;&#10;&lt;list of exceptions&gt;&#10;&#10;Copyright F.A.Q.&#10;&#10;Q. Our product makes use of the NCBI source code, and we made changes and additions to that version of the NCBI code to better fit it to our needs. Can we copyright the code, and how?&#10;&#10;A. You can copyright only the *changes* or the *additions* you made to the NCBI source code. You should identify unambiguously those sections of the code that were modified, e.g. by commenting any changes you made in the code you distribute. Therefore, your license has to make clear to users that your product is a combination of code that is public domain within the U.S. (but may be subject to copyright by the U.S. in foreign countries) and code that has been created or modified by you.&#10;&#10;Q. Can we (re)license all or part of the NCBI source code?&#10;&#10;A. No, you cannot license or relicense the source code written by NCBI since you cannot claim any copyright in the software that was developed at NCBI as a &#39;government work&#39; and consequently is in the public domain within the U.S.&#10;&#10;Q. What if these copyright guidelines are not clear enough or are not applicable to my particular case?&#10;&#10;A. Contact us. Send your questions to &#39;&lt; &lt;&lt;var;name&#61;&quot;email&quot;;original&#61;&quot;email address&quot;;match&#61;&quot;.+&quot;&gt;&gt; &gt;&#39;.&#10;&#10;&lt;&lt;endOptional&gt;&gt;
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