title: License key for magento extension
body: <blockquote>
    <p><strong>Possible Duplicate:</strong><br>
    <a href="https://stackoverflow.com/questions/1157425/license-and-protect-php-script">license and protect php script</a>  </p>
  </blockquote>
  
  
  
  <p>I have a custom Magento extension, and I want to create a license key for it (like windows key).</p>
  
  <p>I will use <code>include</code> method from remote server to check the license key (I am not sure that this is the best choice).</p>
  
  <p>When I have to use include method to check the license key, I think if I do this every time when I use the extension, the site will load slowly.</p>
  
  <p>Can you give me some idea how can I do that or may be give me advice for another decision?</p>