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The hardware ultimately has to decrypt and play the content, so you can use it as a decryption oracle even if you can't extract the key itself.


Sort of, within constraints. L1 both decrypts and decodes, so you can’t really use it as a pure decryption oracle, but it doesn’t matter if you’re going to re-encode it anyway.

Not that it really matters, since HDCP has been cracked. There are a lot of holes here and a lot of problems with DRM.




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