A Xerox scanner/photocopier bug randomly alters numbers in scanned documents, potentially causing incorrect invoices, construction plans, and other documents. The bug is caused by a pattern matching engine that incorrectly replaces image segments, leading to incorrect characters. The issue affects hundreds of thousands of Xerox WorkCentre and ColorQube machines worldwide. The bug has significant legal implications, as scanned documents may not be admissible as evidence due to potential errors.