Active Directory, eDirectory, or both identity sources are configured.
reCAPTCHA supports Active Directory and eDirectory. It does not support other types of identity sources, such as Microsoft SQL Server or Oracle Database type identity sources that use the JDBC identity source connector.
Each identity source is configured with an intrusion detection policy. For more information, see Configuring Intrusion Detection for Failed Logins
A Google reCAPTCHA account is available. See Setting Up a reCAPTCHA Account.