Access Manager 4.4.1 and later versions support only the invisible reCAPTCHA version of reCAPTCHA. reCAPTCHA works on both Name/Password – Form and Secure Name/Password – Form authentication.
reCAPTCHA provides an additional layer of security by requesting users to confirm that they are not a robot. It displays images that users must select based on a matching criteria. If a response succeeds, Access Manager authenticates the user’s authentication credentials. If a response fails, Access Manager does not authenticate the user credentials, and redirects to the login page.
For more information, see Enabling reCAPTCHA.