Illustration: Natalie Peeples/AxiosGracenote, a metadata and identification services company owned by media measurement giant Nielsen, has sued OpenAI for copyright infringement, Axios has learned. Why it matters: Gracenote is suing OpenAI not just for using its metadata without authorization or compensation, but also for copying the relational framework it uses to connect its metadata, which is in part what makes the data valuable to its enterprise clients and useful for consumers. To date, the...