In a divided en banc decision, the U.S. Court of Appeals for the Federal Circuit affirmed the district court’s holding that the claims at issue in CLS Bank v. Alice Corporation are invalid under the “abstract idea” exception to 35 USC § 101. While a majority of the judges agreed that the method and computer-readable medium claims are invalid, they disagreed as to why. Further, the court was evenly split as to whether the systems claims are invalid. (With no majority agreement on that issue, the district court decision is affirmed). Even if this case makes its way to the U.S. Supreme Court, patent-eligibility will remain a murky area of U.S. patent law for the foreseeable future.