title: Can I prevent a user from taking screenshots in a Mac application?
body: <p>I have an image application and I want to release it where unregistered users can view the files but cant save until they've registered.</p>
  
  <p>I'm looking for a way to prevent the user from using the built in screenshot functionality so I don't have to watermark the images. How might I accomplish this?</p>
  
  <p>-- Edit Below --</p>
  
  <p>I decided to watermark the images. I had been trying to avoid watermarking since the images are stereoscopic but I'm rather happy about how the watermark looks now. I put a logo in the corner and offset it enough on each image so it appears in the foreground.</p>
  
  <p>Whether people agree with it in practice or not, my question is still valid. Apple's DVD Player hides the video in its screenshots, which doesn't altogether stop the user from taking screenshots but accomplishes my original goal.</p>
  
  <p>I would still very much like to know how to do this. (the DVD player way)</p>