Transferring a domain name from one company to another generally involves the use of a special transfer code, which different companies refer to as an EPP authentication code, a domain name password or an AuthInfo code. This code can be used as a safety mechanism against unsolicited transfers with all gTLD and with most ccTLD extensions. It can be obtained only by the owner of the particular domain name and is provided by the present domain registrar company. It must be given to the new registrar company because the transfer cannot be initiated without it. The code is case-sensitive and often contains digits and special symbols, so as to impede unauthorized people from breaking it. Certain registrars even alter the codes of domain names registered through them after a particular amount of time for better security.