If you want to transfer a domain name from one domain registrar to another, you’ll need to pass through several security procedures. One of them is obtaining a unique EPP code from the current domain registrar – as long as you are the domain 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, otherwise they won’t be able to start the transfer process. The EPP codes are case-sensitive and may include digits or special symbols such as commas or dots, which can be easily miswritten, so make sure you copy/paste the right code. As an additional safety measure, the transfer code for a domain may be altered on a regular basis. Some domain registrars call this code a domain password, a domain secret or an Auth key as well.