Elon Musk, Tesla and Warner Bros. Discovery have been accused of violating the copyright of the film Blade Runner 2049 during an event where Tesla promoted its robotaxis. The 2017 dystopian film’s producer, Alcon Entertainment, claimed in an Oct. 21 suit in a Los Angeles federal court that Tesla, Musk and Warner Bros. first sought permission to use a still image from the film, which it denied. Tesla wanted the image to hock its “Cybercab” — a fully autonomous car that will operate as a taxi — in an Oct. 10 event hosted at Warner Bros. studio lot in Burbank. Alcon said it knocked back the reque…