title: how to check if client program is an original one in java
body: <blockquote>
    <p><strong>Possible Duplicate:</strong><br>
    <a href="https://stackoverflow.com/questions/14423542/get-a-good-security-for-multiplayer-game">get a good security for multiplayer game</a>  </p>
  </blockquote>
  
  
  
  <p>I made a program with a server and clients they communicate with each other using sockets. I read on this blog that you can never fully hide your source code of a jar file. So can a client not just copy my source code and adjust it a little bit. For example where my program says level += 1; he could do level += 10;
  So is it possible my server program can see if the client program is one i made?</p>