IPhone ios7 restoring? (Security pass)?

Hey guys so i'm buying a used iPhone 4s with iOS7, i'm just wondering if you need the previous APPLE ID after you restore it on PC? Or you just need to put your own APPLE ID? (i already have one)
i'm talking about the new SECURITY PASS of iOS7 before you can use it.

i know i need to tell him to turn-off the "Find my phone" and remove the account on icloud.com? But i think i'll need his apple id after restoring it? Correct me if i'm wrong guys.

He should restore it before selling it to you. Or, meet at the mall, use mall Wi-Fi, and restore it at the Food Court in front of you (if this is some stupid Craiglist purchase)

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