Transferring a domain name from one registrar company to another commonly involves the use of a unique transfer code, which different companies refer to as an EPP authentication code, a domain password or an Auth-Info code. This code can be used as a safety measure against unwanted transfer attempts with all gTLD and with most ccTLD extensions. The code can be obtained only by the domain registrant and is issued by the present registrar company. It must be given to the new registrar because the transfer process cannot be started without it. The code is case-sensitive and traditionally contains digits and special symbols, so as to obstruct unauthenticated persons from breaking it. Certain registrar companies even alter the codes of domain names registered through them after a particular amount of time for even greater safety.