title: What copy protection technique do you use?
body: <p>I'm thinking about adding some kind of copy protection to one of my tools. </p>
  
  <ul>
  <li>Do you have any experience with that?</li>
  <li>Have you developed your own protection techniques or did you buy 3rd party software?</li>
  <li>Do you think it is a viable method to increase sales? (In a private and/or corporate environment)</li>
  <li>What do you do to prevent hassling your paying customers? In most cases it's the <em>paying</em> customers who suffer from a bad copy protection, and I don't want this to happen to my customers. (Even if that means accepting some freeloaders)</li>
  </ul>
  
  <p>I'm especially interested in techniques which allow a trial or freeware version of your software for private use but limit the usefulness in a corporate environment.</p>
  
  <hr>
  
  <p><strong>Related Question</strong>: <a href="https://stackoverflow.com/questions/109997/how-do-you-protect-your-software-from-illegal-distribution">How do you protect your software from illegal distribution</a><br>
  <strong>Related Question</strong>: <a href="https://stackoverflow.com/questions/506282/protect-net-code-from-reverse-engineering/">Protect .NET code from reverse engineering.</a><br>
  <strong>Related Question</strong>: <a href="https://stackoverflow.com/questions/203229/preventing-the-circumvention-of-copy-protection">Prevent the circumvention of copy protection.</a>  </p>