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A CAPTCHA (an acronym for "Completely Automated Public Turing test to tell Computers .... equation and requiring the user to enter the solution as verification.

Problems viewing or passing CAPTCHA verification - Yahoo Help

Learn what CAPTCHA is, and why Yahoo uses it to verify you're human.

The Official CAPTCHA Site

Includes demonstrations, research papers, and news.

Captcha Verification - Qualtrics

Captcha verification is a common web technique to ensure that your visitors are real humans, and not a program written to spam your survey. This can be ...

What exactly is a CAPTCHA? How does it work? | Blog

Oct 11, 2011 ... Websites use CAPTCHAs to keep spammers from posting on their sites. ... verification anymore and all is happy without the sad captcha tripe.

reCAPTCHA Help - Google

Helping everyone, everywhere, one CAPTCHA at a time; Security Help .... ReCAPTCHA will also notify the screen reader of the successful verification.

reCAPTCHA: Easy on Humans, Hard on Bots - Google

We're calling it the No CAPTCHA reCAPTCHA experience. ... As people verify the text in these CAPTCHAs, this information is used to make Google Maps more ...

The system always shows the error of "CAPTCHA verification failed ...

Nov 19, 2011 ... Question. The system always shows the error of "CAPTCHA verification failed" while the code is right. What is the problem? Solution. First of all ...

Captcha script for web forms -

Captcha script. Free and paid HTML code for Captcha form-to-email scripts. Web forms with anti-spam protection, ready to be copied-and-pasted to your site.

Confident Captcha: Image Based Human Verification

Protect your site and improve your user experience with Confident CAPTCHA. Confident CAPTCHA is an image-based human verification technology that ...

Popular Q&A
Q: What is the CAPTCHA verification?
A: CAPTCHA is that funny looking character string that you are asked to enter into the box. The plan is, it's not readable by a machine, so only a human can get pa... Read More »
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A: Its not possible to remove the captcha window from yahoo mail. Read More »
Q: Simple javascript CAPTCHA verification code.
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A: Certified registration data are of vital importance to be sure that the data you are receiving is coming from an actual human being. Simply adding in your regis... Read More »
Q: How can I change it so it uses the CAPTCHA verification code and ...
A: LOL ! Rookie to JavaScripting? Its as simple as this: All the best. 1:2:3:4:5:6:7:8:9:10:11:12:13:14:15:16:17:18:19:20:21:22:23:24: <script type="text/javascrip... Read More »