title: license key for php script
body: <p>I have a script, and I sell it to some people. I need a way to make sure that my script won't work on any website that not in my clients list.</p>
  
  <ul>
  <li>First of all, I am using IonCube to encrypt my PHP code.</li>
  <li>I have all my clients in my server database.</li>
  <li>Each Client has a domain name, email, name, phone.</li>
  </ul>
  
  <p>What is the best method to avoid making people from stealing my script?</p>
  
  <p>I read about making a license key in the script, so any script without license won't work. However, there are many ways to generate a license key without taking my permission right? </p>
  
  <p>All I need is to not activate any script in any domain name, unless I have it in my clients list.</p>