Levi Strauss & Co., in the RFP for media planning and buying for its Levi's and Dockers brands, reportedly asked agencies to share invoices for other clients to compare what fees are charged. It's not known whether the winner, Omnicom Group's OMD, or finalist and incumbent Zenith shared such information. "That is an enormous issue," said Tom Finneran, executive vice president of agency management services at the 4A's. "Our best-practice recommendation for a confidentiality agreement to be included in client agreements specifically calls out media-buying rates as an area that should be protected." A Levi's spokesman had no comment, saying the process was proprietary.