If you’d like to transfer a domain from one company to another, you will have to pass through a few security steps. One of them is getting a unique EPP authentication code from the current domain name registrar – as long as you are the registrant, since the code is sent to the owner's mailbox and no one else can obtain it. You need to provide this code to the new domain registrar, or else they will not be able to start the transfer. The EPP authentication codes are case-sensitive and may comprise of numbers or special characters such as commas or dots, which can be easily mistyped, so make sure you copy & paste the right code. As an additional protection measure, the transfer authorization code for a domain may be changed regularly. Some registrar companies refer to this code as a domain secret, a domain password or an Auth key as well.