If you want to transfer a domain from one company to another, you’ll need to go through several safety steps. One of them is obtaining a special EPP authorization code from the present domain name registrar – on the condition that you are the registrant, since the code is emailed to the owner's email address and nobody else can get it. You have to give this code to the new domain name registrar, otherwise they will not be able to initiate the domain transfer procedure. The EPP authentication codes are case-sensitive and may contain digits or special symbols such as dots or commas, which can be easily miswritten, so make sure you copy & paste the correct code. As an extra safety measure, the transfer code for a domain may be altered regularly. Some domain registrars refer to this code as an Auth key, a domain password or a domain secret as well.