Transferring a domain from one registrar company to another ordinarily involves the use of a unique domain name authorization code, which different companies refer to as an EPP key, a domain password or an AuthInfo code. This code can be used as a security mechanism against unsolicited transfer attempts with all gTLD and with most ccTLD extensions. The code can be obtained only by the domain name registrant and is provided by the current domain registrar company. It must be given to the new registrar company because the transfer cannot be started without it. The code is case-sensitive and normally includes numbers and special characters, so as to obstruct unauthorized people from deciphering it. Some domain registrars even alter the codes of domain names registered through them every once in a while for even better safety.