Documentation for JIRA 4.4. Documentation for other versions of JIRA is available too.

Title: Enabling Public Signup and CAPTCHA  
Author: Mridul Pandey Apr 17, 2009
Last Changed by: Giles Gaskell Aug 02, 2011
Tiny Link: (useful for email) https://confluence.atlassian.com/x/WgfuDw
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JIRA 4.4 (2)
    Page: Configuring JIRA Options
    Page: Managing Users
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