Printers betray document secrets

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Printers betray document secrets
http://news.bbc.co.uk/2/low/technology/3753886.stm

That staple of crime novels - solving a case by identifying the typewriter 
used to write a ransom note - is being updated for the modern day. US 
scientists have discovered that every desktop printer has a signature style 
that it invisibly leaves on all the documents it produces. They have now 
found a way to use this to identify individual laser printers. The work 
will help track down printers used to make bogus bank notes, fake passports 
and other important papers.


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