Transferring a domain from one company to another usually entails the use of a special domain name authorization code, which different registrar companies call an EPP authorization code, a domain password or an Auth-Info code. This code can be used as a security measure against unwanted transfer attempts with all gTLD and with most ccTLD extensions. The code can be obtained only by the domain name owner and is issued by the present registrar. It must be given to the new domain registrar company because the transfer procedure cannot be started without it. The code is case-sensitive and ordinarily comprises of digits and special characters, so as to impede unauthorized people from breaking it. Some domain registrars even change the codes of domains registered through them after a particular interval of time for even better security.