Transferring a domain from one registrar company to another commonly entails the use of a unique domain 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 security mechanism against unwanted transfer attempts with all gTLD and with most ccTLD extensions. It can be obtained only by the domain owner and is provided by the current registrar. It must be given to the new registrar because the transfer cannot be started without it. The code is case-sensitive and generally comprises of numbers and special symbols, so as to hinder unauthorized individuals from cracking it. Some registrars even change the codes of domain names registered through them after a certain interval of time for even better safety.