Transferring a domain from one company to another commonly entails the use of a unique transfer code, which different registrar companies refer to as an EPP key, a domain name password or an AuthInfo code. This code can be used as a protection mechanism against unsolicited transfer attempts with all generic and with most country-code extensions. The code can be obtained only by the domain name registrant and is issued by the present registrar company. It must be given to the new domain registrar company because the transfer cannot be initiated without it. The code is case-sensitive and generally comprises of digits and special symbols, so as to hinder unauthenticated persons from deciphering it. Certain registrar companies even change the codes of domain names registered through them every now and then for even better safety.