establish that they agreed to engage in a joint effort and to keep the shared information confidential from outsiders." Ken's Foods, Inc. v. Ken's Steak House, Inc., 213 F.R.D. 89, 93 (D. Mass. 2002). See also United States v. Sawyer, 878 F. Supp. 295, 297 (D. Mass. 1995) (despite similar interests between empl