Do you use a plugin for CAPTCHA?


I need to allow to register to the users, as I need to have a system for feedback of the content. But I do not know if exist a system that allow by writing the CAPTCHA secret keys just once.



We use this one:

And then we hide the menu from individual books with this code:

<?php add_action( 'admin_menu', function() {
  remove_submenu_page( 'options-general.php', 'recaptcha' );
}, 999 );