Transferring a domain name from one company to another generally entails the use of a special transfer 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 measure against unapproved transfer attempts with all generic and with most country-code extensions. It can be obtained only by the domain registrant and is provided by the current registrar. It must be given to the new domain name registrar company because the transfer procedure cannot be started without it. The code is case-sensitive and commonly includes digits and special symbols, so as to obstruct unauthorized persons from deciphering it. Certain registrars even alter the codes of domain names registered through them after a particular amount of time for greater safety.