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I have a list of 250,000 people here (scraped off web sites) to whom I'd just love to make recorded phone calls. Can I use your protocol to ask them all if it's OK? If not, why not, and how are you going to stop me?
Using a Turing test (CAPTCHA) for example. http://en.wikipedia.org/wiki/Captcha
There are many well known ways to defeat CAPTCHAs, unfortunately.
R's, John
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