Transferring a domain name from one registrar company to another generally involves the use of a special authorization code, which different companies refer to as an EPP key, a domain password or an Auth-Info code. This code can be used as a security measure against unauthorized transfer attempts with all gTLD and with most ccTLD extensions. The code can be obtained only by the domain owner and is provided by the present domain name registrar company. It must be given to the new registrar because the transfer cannot be initiated without it. The code is case-sensitive and often includes digits and special symbols, so as to impede unauthenticated people from guessing it. Certain domain registrars even alter the codes of domains registered through them every once in a while for better safety.