Transferring a domain from one company to another normally entails the use of a special domain name authorization code, which different companies refer to as an EPP key, a domain name password or an AuthInfo code. This code can be used as a safety measure against unauthorized transfer attempts with all gTLD and with most ccTLD extensions. It can be obtained only by the owner of the particular domain name and is issued by the current registrar. It must be given to the new domain name registrar company because the transfer cannot be initiated without it. The code is case-sensitive and ordinarily includes digits and special characters, so as to prevent unauthenticated persons from deciphering it. Some domain name registrars even change the codes of domain names registered through them after a particular interval of time for even better safety.