Contra Proferentum. 2249778 Ontario Inc. v Smith (Fratburger)
In 2249778 Ontario Inc. v Smith (Fratburger) (Ont CA, 2014) the Court of Appeal stated with respect to the rule that an ambiguous contract provision shall be read against the one who drafted it:
 Finally, the rule of contra proferentum applies in cases where the contractual terms are ambiguous: Consolidated-Bathurst Export Ltd. v. Mutual Boiler and Machinery Insurance Co., 1979 CanLII 10 (SCC),  1 S.C.R. 888, at p. 900 and Manulife Bank of Canada v. Conlin, 1996 CanLII 182 (SCC),  3 S.C.R. 415, at pp. 425-426.