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US 6195698

How Websites Use Distorted Text Riddles to Stop Bots

This patent describes the original method for creating CAPTCHAs, using distorted text or audio riddles to distinguish human users from automated bots.

Statusactive

Granted2001

Expires2018

Claims79

Forward citations219

Prior art8

AssigneeCompaq Computer Corp

InventorsAndrei Z. Broder, Krishna Bharat +2

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