Every Account will have unique set of 4 Permission Keys(Posting,Active,Owner,Memo), these get's generated when you sign up for a Steemit Account making each set of Key/Password unique from all others.
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From @muruga
Every Account will have unique set of 4 Permission Keys(Posting,Active,Owner,Memo), these get's generated when you sign up for a Steemit Account making each set of Key/Password unique from all others.