Transferring a domain name from one company to another normally entails the use of a unique domain name authorization code, which different registrar companies call an EPP authentication code, a domain password or an Auth code. This code can be used as a security mechanism against unsanctioned transfers with all gTLD and with most ccTLD extensions. The code can be obtained only by the domain registrant and is provided by the present domain name registrar company. It must be given to the new domain name registrar company because the transfer process cannot be started without it. The code is case-sensitive and ordinarily includes digits and special characters, so as to impede unauthorized individuals from guessing it. Some domain registrars even change the codes of domain names registered through them after a particular amount of time for greater safety.