Transferring a domain name from one company to another ordinarily entails the use of a unique authorization code, which different registrar companies call an EPP authentication code, a domain name password or an AuthInfo code. This code can be used as a protection measure against unsanctioned transfers with all gTLD and with most ccTLD extensions. The code can be obtained only by the owner of the specific domain and is provided by the present registrar. It must be given to the new registrar company because the transfer cannot be started without it. The code is case-sensitive and traditionally comprises of digits and special characters, so as to impede unauthenticated individuals from guessing it. Some registrars even alter the codes of domains registered through them after a given amount of time for better safety.