The UK Supreme Court today issued a landmark judgment on AI patentability that is likely to impact all software patents going forward. The decision in Emotional Perception v. Comptroller General of Patents, Designs and Trade Marks primarily held that the approach taken in Aerotel Ltd v Telco Holdings Ltd [2006] EWCA Civ 1371; [2007] Bus LR 634; [2007] RPC 7 (Aerotel) should no longer be followed. Under Aerotel, courts and examiners consider a four-step test for assessing whether a claim is excluded from patent eligibility: 1) properly construe the claim, 2) Identify the actual/ alleged contribution, 3) Ask whether the contribution is excluded and 4) check if the contribution is technical.