Transferring a domain name from one company to another commonly involves the use of a unique transfer code, which different registrar companies call an EPP authorization code, a domain password or an Auth code. This code can be used as a protection measure against unwanted transfers with all generic and with most country-code extensions. It can be obtained only by the owner of the specific domain name and is issued by the current registrar company. 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 ordinarily contains numbers and special symbols, so as to hinder unauthenticated people from cracking it. Some registrar companies even alter the codes of domains registered through them after a certain interval of time for even greater security.