Transferring a domain from one registrar company to another usually entails the use of a unique transfer authorization code, which different companies call an EPP key, a domain password or an Auth code. This code can be used as a protection mechanism against unapproved transfers with all generic and with most country-code extensions. It can be obtained only by the owner of the given domain name and is provided by the current registrar. It must be given to the new registrar company because the transfer process cannot be initiated without it. The code is case-sensitive and often contains digits and special symbols, so as to prevent unauthorized individuals from hijacking it. Some registrars even alter the codes of domain names registered through them from time to time for better security.