The Federal Court of Australia, in Sunnyfield Association v Cronk [2009] FCA 33, recently provided further evidence that the fair basis requirement in Australia is being interpreted more liberally. Fair basis is analogous to the European requirement of sufficiency of description. A more liberal approach in this area is likely to benefit patentees, and that was certainly the case here, where the court upheld decisions of the Commissioner of Patents to reject oppositions filed against the grant of each of two accepted patent applications.