Transferring a domain from one registrar company to another ordinarily entails the use of a unique transfer code, which different companies call an EPP key, a domain name password or an Auth code. This code can be used as a security measure against unapproved transfers with all generic and with most country-code extensions. It can be obtained only by the owner of the particular domain and is provided by the current domain name registrar company. It must be given to the new domain registrar company because the transfer procedure cannot be initiated without it. The code is case-sensitive and normally includes numbers and special characters, so as to impede unauthorized persons from breaking it. Certain companies even change the codes of domains registered through them after a given interval of time for even greater security.