Transferring a domain from one registrar company to another normally involves the use of a unique authorization code, which different companies call an EPP key, a domain name password or an Auth code. This code can be used as a security mechanism against unsanctioned transfer attempts with all gTLD and with most ccTLD extensions. The code can be obtained only by the owner of the particular domain name and is issued by the present registrar. It must be given to the new domain name registrar company because the transfer cannot be started without it. The code is case-sensitive and often comprises of digits and special symbols, so as to obstruct unauthorized individuals from deciphering it. Some domain registrars even change the codes of domains registered through them after a certain interval of time for even greater safety.