IP analysis: The judgment contains a detailed analysis of the law on the margins of the question, ‘What kind of sign cannot constitute a trade mark?’ or, in positive terms, ‘What kind of sign can constitute a trade mark?’. That question arises from section 1(1) of the Trade Marks Act 1994 (TMA 1994), and Articles 2 and 3(1)(a) of Directive 89/104/EEC (‘the Directive’) and Articles 4 and 7(1)(a) of Regulation (EC) No 40/94 (‘the Regulation’), and their replacements. Ultimately, the appeal was dismissed on the basis that the judge at first instance had not erred in law or principle. She was entitled to come to the conclusions that she did on the matters appealed. However, the judgment of Lord Justice Arnold contains a detailed analysis of the relevant law and is likely to be a useful starting point for practitioners considering this fundamental question, and a handy omnibus authority to avoid over-citation. Written by Michael Smith, barrister at Three Stone Chambers.