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Brushing off an agreed restrictive covenant: Ontario Court on the enforcement of “No Challenge Clause” [Loops v. Maxill Inc., 2020 ONSC 971]A party cannot be barred from raising the defense of patent invalidity despite of a prior promise of not to challenge it. Parties in the present case involved a subsidiary which was one of the reasons for such an outcome. However, there is no analysis in the judgment on the relationship between parent and the subsidiary corporation and the reasoning as to why the subsidiary corporation is excluded from the settlement obligations except that it’s a different legal entity.