Documentation for Confluence 5.8 (Server).
Documentation for Confluence Cloud and earlier versions of Confluence is available too.

Title: Configuring Captcha for Failed Logins  
Author: Sarah Maddox [Atlassian] Apr 27, 2010
Last Changed by: Rachel Robins [Atlassian Tech Writer] Feb 21, 2013
Tiny Link: (useful for email)
Export As: Word  
Incoming Links
Parent Page
    Page: Configuring Confluence Security
Global Labels (2)