A long commute of listening to NPR makes for a person who has a lot to contribute at dinner parties, and it also helps with the occasional blog entry. Here’s an item from yesterday’s All Things Considered: in an interview with Purdue University Professor Edward Delp, I learned that every printer, scanner and digital camera leaves a unique signature which allows the documents created with the device to be tracked back. Astonishing. Not only of interest for forensic experts, but potentially also for archivists (provenance, anybody?) and folks thinking about digital preservation.