Police claims to have fingerprinted computer based on printed document
Most interesting parts (IMO):<p><i>“Program and program settings: When preparing the letter, WordPad for Windows is most likely used. Default settings for font, line spacing and paragraph are used. The page layout has been Letter.”</i><p>That, I think, can be inferred with good confidence from precisely measuring various font measurements, looking at how lines got broken, etc, and comparing that with a database of program defaults for a large set of OSes and programs.<p><i>“Device, operating system and video card : When designing the threat letter, a Windows PC has been used, with an operating system Windows 10 or 8.”</i><p>I guess either WordPad or the font got tweaked somewhat in that Windows version. Maybe WordPad started using ligatures more aggressively, its page width got a tiny bit wider, or, in the font, some letter shape or spacing table changed a tiny bit, or a character was added.<p><i>“The PC has had an integrated video card, Intel HD Graphics 630.”</i><p>That, for me, is the most intriguing part. Does Windows use the GPU to render fonts even if they get printed, and are there subtle differences between GPUs and their software rendering that, statistically, can be recovered from the somewhat noisy print?