The Page Security (ti ti-lock) dialog allows you to set security for the page. This allows you to determine who can view and administrate the current page. Note that page security is hierarchical. If no specific security rights are defined by a page, it will use the security settings of its parent and its parent's parent. If no page above it defines any specific rights it will use the rights defined for the site. This allows for a robust and flexible security implementation with minimal configuration.