Transferring a domain from one registrar company to another usually involves the use of a special domain authorization code, which different registrar companies refer to as an EPP authorization code, a domain name password or an Auth-Info code. This code can be used as a security measure against unwanted transfers with all gTLD and with most ccTLD extensions. It can be obtained only by the owner of the specific domain and is provided by the current registrar. It must be given to the new registrar company because the transfer procedure cannot be started without it. The code is case-sensitive and normally includes digits and special characters, so as to hinder unauthenticated individuals from cracking it. Some registrars even alter the codes of domains registered through them every once in a while for even greater security.