> I can't remember where I saw it, but one service I signed up to had the
> option to click a link and *hear* the keyword as well...

I wonder why they bother to include a CAPTCHA at all, in this case? If
you really wanted to defeat this system, all you would need to do would
be to grab the audio file and run a speech-to-text converter on it.

-- 
Andrew Taumoefolau

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