If you wish to transfer a domain from one registrar to another, you’ll need to pass through several security procedures. One of them is getting a special EPP authentication code from the current registrar – as long as you are the registrant, since the code is emailed to the owner's email and no one else can obtain it. You will need to provide this code to the new registrar, otherwise they won’t be able to initiate the transfer. The EPP authentication codes are case-sensitive and may include numbers or special characters such as dots or commas, which can be easily miswritten, so make sure you copy & paste the correct code. As an extra security measure, the transfer authorization code for a domain may be altered on a regular basis. Certain domain name registrars refer to this code as an Auth key, a domain password or a domain secret as well.