title: PHP to view PDF on web page and disable user to download
body: <p>I'm going to write a site that lets users to view pdf files but I don't want them to save the files to their own hard drive due to the copy right law. I'm researching how to view it by using PHP, but I have no idea how to disable user not to download the files.</p>
  
  <p>Actually, I want to use JavaScript to disable this action, but I get suggestions from other people not to do so because it's annoying to user.</p>
  
  <p>So any suggestion or help would be very much appreciated.</p>