What is EPP Code
The EPP key (Authorization code) is one of the safeguards against unauthorized transfers of domain name registrations and it protects your rights as a domain owner. The EPP key is required when transferring .com, .net, .org, .biz, .info and .us domain names. It is not possible to initiate a domain name transfer for these domains without an EPP code.
Where to find the EPP Code
If your domain is registered by Cloud DataWorks you can obtain the EPP key in your ???.
This is how EPP code looks like : 
