American Express Co. and Discover Financial Services, the credit card unit of Morgan Stanley Dean Witter & Co., have settled their differences over a trademark infringement lawsuit.

Discover sued Amex in November over a product called American Express Cash Back. Discover claimed that its trademark entitles it to exclusive rights to the term "cash back." The lawsuit also accused Amex of falsely claiming the Amex product is superior to the Discover card.

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