Found it, because I'm psychotic and wouldn't be able to rest until I did. At the end of the fourth book, when Voldemort is restored to his body, he says to the Death Eaters who have gathered:
"But how to get at Harry Potter? For he has been better protected than I think even he knows, protected in ways devised by Dumbledore long ago, when it fell to him to arrange the boy's future. Dumbledore invoked an ancient magic, to ensure the boy's protection as long as he is in his relation's care. Not even I can touch him there..."
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Date: 2003-06-29 03:46 pm (UTC)"But how to get at Harry Potter? For he has been better protected than I think even he knows, protected in ways devised by Dumbledore long ago, when it fell to him to arrange the boy's future. Dumbledore invoked an ancient magic, to ensure the boy's protection as long as he is in his relation's care. Not even I can touch him there..."