An Illinois appellate court has formally recognized what both state and federal courts have already considered to be the law—that coparties to a lawsuit who agree to share information pursuant to a common interest in defeating their opponent do not waive either the attorney-client or work-product privilege when they do so.1Parties may object to disclosing these communications when sought by the opposing side in discovery.2 The necessity of this holding as a matter of first impression may come as a surprise to many practitioners who already regularly assert the joint defense privilege in Illinois state courts. The Selby court recognized that “a lot of practitioners and judges will be surprised to learn that [the joint defense privilege] has not already been recognized in Illinois.”3 The doctrine has implicitly existed in federal courts sitting in Illinois for decades, and practitioners have routinely asserted the defense in both state and federal tribunals.4 But although federal courts have conclusively stated that Illinois state law recognizes the joint defense privilege, Selby is the first Illinois appellate court case to finally do so.5
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