If I understand correctly, to join a Windows domain, a machine needs to have an account on Active Directory, and have the password to authenticate. Such a password is renewed automatically every 30 days.
Now, I have a Linux machine on the corporate network, with the IT dept's blessing, and Samba can join a domain and would allow me to do so, but they don't want to add it. I want to use the account I have on a Windows machine I'm going to reformat anyway. I couldn't find a way to decode the key stored in the registry.