Transferring a domain from one company to another commonly entails the use of a unique authorization code, which different companies refer to as an EPP key, a domain name password or an Auth-Info code. This code can be used as a security mechanism against unsanctioned transfer attempts with all generic and with most country-code extensions. It can be obtained only by the owner of the specific domain and is issued by the present domain name 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 normally comprises of numbers and special characters, so as to impede unauthenticated individuals from guessing it. Some domain registrars even change the codes of domains registered through them periodically for even greater safety.