Transferring a domain name from one registrar company to another commonly involves the use of a special transfer code, which different registrar companies refer to as an EPP authorization code, a domain name password or an Auth-Info code. This code can be used as a security measure against unapproved transfer attempts with all gTLD and with most ccTLD extensions. It can be obtained only by the owner of the specific domain name and is issued by the present registrar. It must be given to the new domain name registrar company because the transfer process cannot be initiated without it. The code is case-sensitive and usually contains digits and special symbols, so as to stop unauthorized persons from cracking it. Certain registrars even alter the codes of domains registered through them after a given amount of time for even greater security.