Transferring a domain name from one company to another usually involves the use of a special domain authorization code, which different registrar companies call an EPP key, a domain password or an Auth code. This code can be used as a protection measure against unsanctioned transfer attempts with all generic and with most country-code extensions. The code can be obtained only by the owner of the particular domain name and is issued by the present domain name registrar company. It must be given to the new registrar because the transfer process cannot be started without it. The code is case-sensitive and frequently contains digits and special characters, so as to prevent unauthorized people from deciphering it. Some domain name registrars even change the codes of domain names registered through them after a given amount of time for even greater safety.