Transferring a domain name from one registrar company to another generally involves the use of a special domain authorization code, which different registrar companies call an EPP key, a domain password or an AuthInfo code. This code can be used as a safety measure against unauthorized transfers with all generic and with most country-code extensions. The code can be obtained only by the owner of the specific domain name and is issued by the present registrar company. It must be given to the new domain name registrar company because the transfer process cannot be started without it. The code is case-sensitive and ordinarily contains numbers and special symbols, so as to impede unauthorized persons from cracking it. Some domain name registrars even alter the codes of domain names registered through them after a given interval of time for even greater security.