Transferring a domain from one company to another commonly entails the use of a special domain authorization code, which different registrar companies refer to as an EPP key, a domain password or an Auth code. This code can be used as a security measure against unsanctioned transfers with all gTLD and with most ccTLD extensions. The code can be obtained only by the owner of the given domain name and is provided by the current domain name registrar company. It must be given to the new domain name registrar company because the transfer procedure cannot be initiated without it. The code is case-sensitive and typically contains numbers and special symbols, so as to hinder unauthenticated persons from guessing it. Some companies even change the codes of domain names registered through them once in a while for even greater safety.