If you wish to transfer a domain name from one domain registrar to another, you’ll have to go through several security procedures. One of them is obtaining a unique EPP authorization code from the present registrar company – on the condition that you are the domain registrant, since the code is sent to the owner's mailbox and nobody else can obtain it. You need to provide this code to the new domain name registrar, otherwise they will not be able to start the domain transfer. The EPP authentication codes are case-sensitive and may comprise of numbers or special symbols such as dots or commas, which can be easily miswritten, so make sure you copy and paste the right code. As an additional security measure, the transfer authorization code for a domain may be altered on a regular basis. Certain registrars call this code a domain password, a domain secret or an Auth key as well.