This episode covers an opinion from the United States Court of Appeals for the Federal Circuit regarding a patent dispute between International Business Machines Corporation (IBM), the appellant, and Zillow Group, Inc., and Zillow, Inc. (Zillow), the cross-appellants. The appeal and cross-appeal stem from a decision by the Patent Trial and Appeal Board (Board) concerning the patentability of claims in IBM’s ’346 patent, which relates to single sign-on (SSO) operations. The court ultimately affirms the Board's decision, which had found certain claims unpatentable based on the prior art reference Sunada and had found other claims not unpatentable. Key issues addressed include whether the Board overstepped the scope of the original petition when assessing "protected resources" and whether the Board had substantial evidence for its findings regarding an "identifier associated with the user".
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