Transferring a domain name from one company to another generally entails the use of a special transfer code, which different registrar companies refer to as an EPP authorization code, 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. It can be obtained only by the owner of the particular domain name and is provided by the current domain name registrar company. It must be given to the new domain registrar company because the transfer cannot be started without it. The code is case-sensitive and normally contains numbers and special symbols, so as to hinder unauthorized people from cracking it. Certain registrar companies even alter the codes of domain names registered through them after a certain interval of time for even better security.