I was thinking more of https://en.wikipedia.org/wiki/Pretty_Good_Privacy#Criminal_investigation https://en.wikipedia.org/wiki/Pretty_Good_Privacy#Criminal_i...,

I was thinking more of https://en.wikipedia.org/wiki/Pretty_Good_Privacy#Criminal_investigation https://en.wikipedia.org/wiki/Pretty_Good_Privacy#Criminal_i..., actually, but that's a good example too.