Captcha control is not working at http://domain/login page

Document ID : KB000097339
Last Modified Date : 22/05/2018
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The customer wants to use captcha control at login pages. We enabled portal captcha funtionallity via following command in the file but the functionallity doesnt work correctly at http://domain/login page.
Commnad :  C
hanged File: SYSTEM/conf/sitebuilder/packages/layer7/modules/DeveloperRegistration/xsl/login-form.xml.

Portal 3.5 CR07
Unfortunately, we do not support a captcha on the login form, the captcha feature is only supported on the registration form. 
With the 3.5 portal in maintenance mode, we do not anticipate adding this feature in the future.