How it Works

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  1. In order to distinguish a human from a computer program, users at a website are presented with a set of images.
  2. The user is asked to identify then click a particular sequence of images. E.g. “dogs” then “boats” then “trains”. Alternatively, the user may identify then type a sequence of letters overlaid on the images.
  3. Completed correctly, the user is verified and is allowed to continue their online session.

Note: the images, their positions, and the letters on the images change every time, protecting websites against malicious bots and spamware.