How to logout of iCloud without a password on iOS 9.0.2?

I bought a used iPhone 5s today and I have everything personalized. Except iCloud. It will not let me log out unless I have a password to the account. There's no way to figure out the password, as I bought it off craigslist, and do not know the guy. So my question is: How do I log out of iCloud without a password on iOS 9.0.2?

You can't log out of iCloud without entering in the password for the account.

I don't think you can do a factory reset without the password, either, at least if they enabled Find my iPhone.

If the guy you bought it from didn't give you the info, there's a fairly decent chance you purchased a stolen phone.

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