Transferring a domain from one registrar company to another normally entails the use of a unique transfer code, which different companies call an EPP authorization code, a domain password or an Auth code. This code can be used as a security mechanism against unsolicited transfer attempts with all gTLD and with most ccTLD extensions. It can be obtained only by the domain name owner and is issued by the present domain registrar company. It must be given to the new registrar because the transfer procedure cannot be started without it. The code is case-sensitive and commonly includes numbers and special symbols, so as to obstruct unauthenticated people from deciphering it. Certain registrar companies even change the codes of domain names registered through them after a certain amount of time for even better safety.