Photocopiers made by Xerox are changing numbers on documents, a German computer scientist has discovered
David Kriesel found that copies he made of construction plans had altered room dimensions.
Other users have replicated the problem, which has been blamed on faults with compression software used by several Xerox models.
The company has not yet issued a fix for the problem, but it told the BBC it was preparing a statement.
Mr Kriesel said he worried that numbers could be altered on invoices and other important documents.