[snugs]

Don't really see what the problem is unless you are doing something illegal.

I am a typist and before the age of computers and computer printers the typeface on the typewriter was well known to be unique to each typewriter

The only difference I suppose is that the article is inferring that the printer can actually be traced to the owner without prior knowledge of that owner which of course you would have needed to trace a typewriter.

[The Electrician]

I am a typist and before the age of computers and computer printers the typeface on the typewriter was well known to be unique to each typewriter

Typewriter typeface impressions were supposedly registered with the Romanian government when it was a Communist dictatorship, so that the authorities could more easily arrest anybody writing or publishing anti-Communist documents. Who says that it can't happen here?