Will recaptcha keys (public and private) expire ?

I have registered for recaptcha V1 and I got public and private keys. Will these keys expire ? If so, when ? and what I need to do next ? -- 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.