google recaptcha

google recaptcha
https://www.google.com/recaptcha/

doc
https://developers.google.com/recaptcha/docs/start

New reCaptcha with jQuery Validation Plugin
http://stackoverflow.com/questions/29563822/new-recaptcha-with-jquery-validation-plugin

How can I validate google reCAPTCHA v2 using javascript/jQuery?
http://stackoverflow.com/questions/27902539/how-can-i-validate-google-recaptcha-v2-using-javascript-jquery



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