Transferring a domain name from one registrar company to another generally involves the use of a special transfer authorization code, which different registrar companies refer to as an EPP authorization code, a domain name password or an AuthInfo code. This code can be used as a security measure against unauthorized transfers with all gTLD and with most ccTLD extensions. The code 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 registrar company because the transfer procedure cannot be initiated without it. The code is case-sensitive and often includes digits and special characters, so as to impede unauthenticated individuals from breaking it. Certain domain name registrars even change the codes of domains registered through them after a given amount of time for better security.