is it legal to host "api.js" on my server?

Hello, I have read the license terms and it is not clear to me. I would like to host "api.js" in my own server. Do not want to call it online. Is it legal? I will not modify anything at all. Thanks in advance. -- 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.