If you decide to transfer a domain from one registrar to another, you’ll need to pass through a couple of safety procedures. One of them is obtaining a unique EPP authorization code from the present domain registrar – provided that you are the registrant, since the code is emailed to the owner's email and nobody else can obtain it. You need to give this code to the new domain registrar, or else they won’t be able to begin the domain transfer procedure. The EPP authentication codes are case-sensitive and may contain digits or special characters such as dots or commas, which can be easily mistyped, so make sure you copy/paste the right code. As an extra security measure, the transfer code for a domain name may be changed regularly. Certain registrars call this code a domain secret, a domain password or an Auth key as well.