I didn't even sign up for reCAPTCHA and dont want it, how do i remove it.

It randomly popped while being on a website and now wont stop popping up. I don't want to use it and I am not even signed up and don't want to. How do I remove this? -- 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.