title: How to disable image caching as3?
body: <p>I have a web application developped using as3. The problem is that these application loads some image files, and add my watermark to them.
  What is happening is that these images are being cached by the browser, allowing the users who know how to access the tmp folder, to get these files, without my watermark.</p>
  
  <p><strong>Adding the watermark previously to the image, is not an alternative for me, due the fact that when the a premium user is logged in the watermark is not added.</strong></p>
  
  <p>How can I disable the caching?</p>
  
  <p>Thanks.</p>