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What if the decryption key is "I am guilty of the murder", would it then be protected since the act of revealing it would be self incriminating?

How would that work? If I write "I just killed a child" here it doesn't mean I actually did that. Similarly. if I used a decryption key "I am guilty of the murder" then it still does not mean I'm guilty of any murder, just that I have a poor sense of humour and used an odd encryption key.

That encryption key wouldn't provide proof, but there are many that would. Trivially a sufficiently long key could embed a video of the murder.

And it would be trivially impossible to memorize.

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