Transferring a domain from one company to another typically entails the use of a unique transfer code, which different companies refer to as an EPP authorization 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. It can be obtained only by the owner of the specific domain name and is issued by the present domain registrar company. It must be given to the new registrar company because the transfer procedure cannot be initiated without it. The code is case-sensitive and usually includes digits and special characters, so as to obstruct unauthenticated persons from cracking it. Some domain registrars even change the codes of domain names registered through them after a given amount of time for even greater safety.