Transferring a domain from one registrar company to another typically entails the use of a unique domain authorization code, which different registrar companies refer to as an EPP authorization code, a domain password or an Auth-Info code. This code can be used as a protection measure against unsanctioned transfers with all gTLD and with most ccTLD extensions. It can be obtained only by the domain name owner and is issued by the current 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 ordinarily contains digits and special characters, so as to obstruct unauthenticated people from breaking it. Certain companies even alter the codes of domain names registered through them from time to time for even better safety.