when the revenue was recognized, not the validity of the revenue. Xerox's restatement only changed what year the revenue was recognized. On December 20, 2002, Xerox Corporation reported that it had discovered an error in the calculation of its non-cash interest expense related to a debt instrument and associated interest rate swap agreements, resulted in after-tax understatement of interest expense of approximately $5 million to $6 million or less than 1 cent per share in each of the four quarters of 2001 and for the first three quarters of 2002. In response to the SEC's complaint, Xerox Corporation neither admitted nor denied wrongdoing. It agreed to pay a $10 million penalty and to restate its financial results for the years 1997 through 2000. On June 5, 2003, six Xerox senior executives accused of securities fraud settled their issues with the SEC and neither admitted nor denied wrongdoing. They agreed to pay $22 million in penalties, disgorgement, and interest. The company received approval to settle the securities lawsuit in 2008. On January 29, 2003, the SEC filed a complaint against Xerox's auditors, KPMG, alleging four partners in the "Big Five" accounting firm permitted Xerox to "cook the books" to fill a $3 billion "gap" in revenue and $1.4 billion "gap" in pre-tax earnings. In April 2005 KPMG settled with the SEC by paying a US$22.48 million fine. Meanwhile, Xerox paid a civil penalty of $10 million. As part of the settlement KPMG neither admits nor denies wrongdoings. During a settlement with the Securities and Exchange Commission, Xerox began to revamp itself once more. As a symbol of this transformation, the relative size of the word "Xerox" was increased in proportion to "The Document Company" on the corporate signature, and the latter was dropped altogether in September 2004, along with the digital X. However, the digital X and "The Document Company" were still used by Fuji Xerox until April 2008. Character substitution bug In 2013, German computer scientist David Kriesel (de) discovered an error in a Xerox WorkCentre 7535 copier. The device would substitute number digits in scanned documents, even when OCR was turned off. For instance, a cost table in a scanned document had an entry of 85.40, instead of the original sum of 65.40. After unsuccessfully trying to resolve this issue with Xerox's customer support, he publicised his findings on his blog. Providing example pages that would lead to the