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Google Developers Codelabs

Google reCAPTCHA Keys

Google reCAPTCHA Keys | Easy On Humans, Hard On Bots Toolkit

Google reCAPTCHA Keys offers a free service to your website safeguarding it from spam and abuse. Further, Google’s reCAPTCHA Keys algorithm uses an advanced risk analysis engine and adaptive CAPTCHAs to keep automated software from engaging in abusive activities on your site.