title: Encrypt image with php to prevent download in HTML Email?
body: <p>I got a request from a client asking to "encrypt some images to prevent people from downloading them". This will be within an HTML email from some email sending application that I do not know of at this time, so I will need to use a string for the source such as "http://somewhere.com/images/img.jpg" etc. Does that kind of thing even exist? The only thing I can think of is 'encrypting' an image so instead of the src being "whatever/img.jpg", it would be "http://somewhere.com/img.php?i=12383824724. But I am just spitballing and don't know how that would work. Before you start answering:</p>
  
  <ol>
  <li>Client knows we can put a watermark on the images</li>
  <li>Client knows we can put image as a background (using appropriate methods for cross client compatibility)</li>
  </ol>
  
  <p>Any ideas? Thanks all,</p>
  
  <p>Fil</p>