Transferring a domain from one registrar company to another commonly involves the use of a unique domain name authorization code, which different registrar companies call an EPP authentication code, a domain name password or an Auth code. This code can be used as a safety measure against unwanted transfers with all generic and with most country-code extensions. It can be obtained only by the domain name registrant and is provided by the present domain registrar company. It must be given to the new registrar company because the transfer procedure cannot be started without it. The code is case-sensitive and often includes numbers and special symbols, so as to impede unauthenticated individuals from hijacking it. Certain companies even change the codes of domain names registered through them after a certain period of time for even greater security.