Re. "textual fingerprinting" -- this is a well-established field (decades old), especially in forensics. It more commonly goes under the name "authorship attrib

Re. "textual fingerprinting" -- this is a well-established field (decades old), especially in forensics. It more commonly goes under the name "authorship attribution". For a taste, see e.g. http://www.ncfta.ca/papers/emailforensics.pdf http://www.ncfta.ca/papers/emailforensics.pdf or http://ai.arizona.edu/intranet/papers/isi_visualizing_authorship.pdf http://ai.arizona.edu/intranet/papers/isi_visualizing_author... .