The American AI company Anthropic announced it will add an invisible watermark to text produced by its Claude chatbot so as to comply with European Union regulations . But the company noted that this mark only means the text was processed by Claude, not that the chatbot actually generated it. The new feature unveiled on Monday in San Francisco will not be visible to humans and will remain in place even after text is cut-and-pasted. But the tool has limitations, Anthropic said. Detecting a Claude watermark means the text may have been processed by Claude but does not confirm the source, the company said in a statement. For example, it said, “Claude may not be the original author. People often use Claude to proofread, translate, summarise, or convert files. The output can carry a Claude mark even if the underlying ideas, text, or data originated from another source.” Conversely, a text that is very short or has been heavily edited may not carry a watermark. When Claude generates a ...