Transferring a domain name from one company to another traditionally involves the use of a unique transfer authorization code, which different companies call an EPP authorization code, a domain name password or an Auth-Info code. This code can be used as a protection measure 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 name registrar company. It must be given to the new registrar because the transfer process cannot be initiated without it. The code is case-sensitive and commonly includes numbers and special symbols, so as to obstruct unauthorized persons from guessing it. Some registrars even alter the codes of domains registered through them after a particular amount of time for even better security.