Timeline for Practical non-image based CAPTCHA approaches?
Current License: CC BY-SA 2.5
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| when toggle format | what | by | license | comment | |
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| Feb 7, 2009 at 22:09 | history | answered | Norman Ramsey | CC BY-SA 2.5 |
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| Feb 7, 2009 at 22:09 | history | answered | Norman Ramsey | CC BY-SA 2.5 |