Transferring a domain from one company to another traditionally entails the use of a unique authorization code, which different companies call an EPP authorization code, a domain name password or an Auth code. This code can be used as a security mechanism against unsolicited 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 current domain registrar company. It must be given to the new registrar because the transfer procedure cannot be started without it. The code is case-sensitive and frequently includes numbers and special characters, so as to prevent unauthenticated individuals from breaking it. Some domain name registrars even change the codes of domain names registered through them after a given amount of time for even better safety.