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[Bob Schroeck]

Bluemage wrote:

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Now, here's the real $64,000 question.  How do the mechanics of the Fidelius react when the SK's knowledge of the Secret is obliviated?  Is it possible to cast the charm, get told the Secret, than make the SK unaware that they know it?  Can wiping the mind of the SK destroy any 'pointers'?

I think it's in Harry Potter and the Power of Paranoia that Harry does exactly that -- he picks a random Muggle as his secret keeper, does the whole ritual, and then obliviates him.  The secret holds until the keeper gets himself hit by a car years later.  
-- Bob
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Then the horns kicked in...
...and my shoes began to squeak.