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

      <h1 property="dc:title">Ferguson Twofish 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">Ferguson Twofish License</code></p>

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

      <h2>Other web pages for this license</h2>
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             <li>
               <a href="https://github.com/wernerd/ZRTPCPP/blob/6b3cd8e6783642292bad0c21e3e5e5ce45ff3e03/cryptcommon/twofish.c#L113C3-L127" rel="rdfs:seeAlso" isValid=true isLive=true isWayBackLink=false match=false timestamp=2025-07-01T15:05:31Z>https://github.com/wernerd/ZRTPCPP/blob/6b3cd8e6783642292bad0c21e3e5e5ce45ff3e03/cryptcommon/twofish.c#L113C3-L127</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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         <p>
            The author hereby grants a perpetual license to everybody to
            use this code for any purpose as long as the copyright message is included
            in the source code of this or any derived work.
         </p>

         <p>
            Yes, this means that you, your company, your club, and anyone else
            can use this code anywhere you want. You can change it and distribute it
            under the GPL, include it in your commercial product without releasing
            the source code, put it on the web, etc.<br />

            The only thing you cannot do is remove my copyright message,
            or distribute any source code based on this implementation that does not
            include my copyright message.
         </p>

         <p>
            I appreciate a mention in the documentation or credits,
            but I understand if that is difficult to do.
            I also appreciate it if you tell me where and why you used my code.
         </p>

      
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      <h2  id="licenseHeader">Standard License Header</h2>
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      The author hereby grants a perpetual license to everybody to use this code for any purpose as long as the copyright message is included in the source code of this or any derived work.&#10;&#10;Yes, this means that you, your company, your club, and anyone else can use this code anywhere you want. You can change it and distribute it under the GPL, include it in your commercial product without releasing the source code, put it on the web, etc.&#10;The only thing you cannot do is remove my copyright message, or distribute any source code based on this implementation that does not include my copyright message.&#10;&#10;I appreciate a mention in the documentation or credits, but I understand if that is difficult to do. I also appreciate it if you tell me where and why you used my code.&#10;&#10;
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