Unknown email password required after selecting iCloud backup While restoring or setting up an iPhone (new or old) and choosing a backup from list of provided backup in my iCloud, I'm shown to enter a password for kmward@roadrunner.com , which I don't have idea of who's email that belongs to, I have lots of data on my iCloud and this scares me because why would Apple ask for some other account password? When I choose 'skip this step', I'm given a model message saying, "you must sign in to restore purchased content" and when I do tap skip, it restores from my own account (which earlier I provided credentials). 
Why does it ask for someone else's account password?


Is my account hacked?
Is my account linked to someone I don't know?
Is my content being distributed to someone from kmward@roadrunner.com ?


What should I do to secure and remove this unknown account that Apple ask password for?
The cause of this problem is very simple and isn't related to privacy issue or "left over ids" from refurbrished devices.

You have PIRATED music in your library.  

When restoring the back-up, iOS tries to authenticate the PIRATED files and realizes the account has been locked down.