Transferring a domain name from one registrar company to another typically involves the use of a special transfer authorization code, which different companies call an EPP authentication code, a domain password or an AuthInfo code. This code can be used as a safety measure against unsolicited transfers with all gTLD and with most ccTLD extensions. It can be obtained only by the domain registrant and is issued by the present registrar company. It must be given to the new domain registrar company because the transfer cannot be started without it. The code is case-sensitive and generally includes numbers and special characters, so as to hinder unauthenticated individuals from breaking it. Some domain registrars even change the codes of domains registered through them after a given interval of time for better security.