No CAPTCHA reCAPTCHA - client verification - no secret

Hi,so secret key is not needed when using client side JavaScript verification(grecaptcha.getResponse, http://bit.ly/1vOL4lL)?Or have I missed something?Thanks -- You received this message because you are subscribed to the Google Groups "reCAPTCHA" group. To unsubscribe from this group and stop receiving emails from it, send an email to recaptcha+unsubscribe@googlegroups.com. To post to this group, send email to recaptcha@googlegroups.com. Visit this group at http://bit.ly/1dkFnYd. For more options, visit http://bit.ly/P65DvS.