Transferring a domain from one company to another normally involves the use of a unique authorization code, which different companies refer to as an EPP key, a domain name password or an Auth-Info code. This code can be used as a protection measure against unwanted transfer attempts with all gTLD and with most ccTLD extensions. It can be obtained only by the domain name registrant and is provided by the present domain name 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 includes numbers and special symbols, so as to stop unauthenticated people from deciphering it. Some companies even reset the codes of domain names registered through them after a certain period of time for even better security.