It's Unclear From the Article... but I wonder if one of the trademarks she assigned was her signature. If not, I'm not sure this ruling makes sense. Reuters reports that "Princess Diana's dressmaker loses fight over name." From the article: "In 1999, she launched a fight to get her name back after the company that bought her trademark started selling clothes under her signature. Media reports quoted her as saying she was heartbroken that people thought she had designed the garments."