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Friday, February 21, 2003
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On 9/24/02 I mentioned MailFrontier's pending patent on an anti-spam system that responds to unknown senders with an emailed challenge. I mentioned that a patent on that might be problematic because many people have no doubt been thinking about it for years.
Today, in response to that post, I received word of this prior art.
1:14:07 PM 
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© Copyright 2006 Gary Robinson.
Last update: 1/30/06; 2:45:22 PM.
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