Sources
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Stylometry. An indicator, not proof
Comparing texts by manner of writing helps to check a hypothesis about an author. It cannot establish the author, and the report says so in plain words.
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An email address as a record. What it says and what it does not
An address in a public document is a source, not evidence. Covered here: what can lawfully be read from it, how it is recorded, and what belongs to the subject of the work.

