1221 (D.C. Cir. 1981). "Once a party has disclosed work product to an adversary, it waives the work product doctrine as to all other adversaries." McMorgan v. Co. v. Fist Cal. Mortg. Co., 931 F. Supp. 703 (N.D. Cal. 1996). The majority rule throughout the United States is that even a confidentiality agreement