Other recent related submissions/discussions:

https://news.ycombinator.com/item?id=34815391 - "Xerox copier flaw changes numbers in scanned docs (2013)" (theregister.com), 36 points, 3 months ago, 8 comments

https://news.ycombinator.com/item?id=32537073 - "JBIG2 Undetectable Data Corruption: Destroying Our Past, One Character at a Time" (circuitousroot.com), 67 points, 9 months ago, 34 comments