Timeline for Practical non-image based CAPTCHA approaches?
Current License: CC BY-SA 2.5
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| Aug 21, 2008 at 12:16 | history | answered | Chris Bartow | CC BY-SA 2.5 |
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| Aug 21, 2008 at 12:16 | history | answered | Chris Bartow | CC BY-SA 2.5 |