Midjourney is trying to force Disney, Universal and Warner Bros. to reveal how they use artificial intelligence as it defends itself from a potentially ruinous copyright lawsuit. The studios sued the AI image lab last year, accusing it of enabling massive infringement of their copyrighted characters. Midjourney has claimed “fair use” and has argued that the studios are engaged in the very same AI practices. In June, a magistrate judge limited Midjourney’s ability to obtain discovery from the stu...