title: How can I create a product key for my C# application?
body: <p>How can I create a product key for my C# Application?</p>
  <p>I need to create a product (or license) key that I update annually.  Additionally I need to create one for trial versions.</p>
  <blockquote>
  <p>Related:</p>
  <ul>
  <li><a href="https://stackoverflow.com/questions/501988">How do I best obfuscate my C# product license verification code?</a></li>
  <li><a href="https://stackoverflow.com/questions/109997">How do you protect your software from illegal distribution?</a></li>
  </ul>
  </blockquote>