On wikipedia there’s some suggestion that methods that involve intensity of toner/ink across a document could be used to uniquely identify a machine but no such methods are currently publicly known (at least as far as the Wikipedia article has been updated)
On wikipedia there’s some suggestion that methods that involve intensity of toner/ink across a document could be used to uniquely identify a machine but no such methods are currently publicly known (at least as far as the Wikipedia article has been updated)
Digimarc
Source: I work in flexography.