Nayanthara’s upcoming Netflix documentary Nayanthara: Beyond The Fairy Tale is all set to bring forth some unforeseen moments from the diva’s life on-screen. However, it seems to have hit a roadblock as superstar Dhanush has slammed the producers with a 10 crore copyright case for using 3-second clippings from the actress’ film Naanum Rowdy Dhaan, which he had produced. And now the diva decided to give it back with an open letter to the Raayan star. Taking to Instagram, Nayanthara shared a long letter directed to Dhanush, expressing her angst and surprise over the copyright claim he imposed on her Netflix documentary worth Rs. 10 crores. She called it an act of vengeance, as the latter did not oblige them with an NOC to use some clippings from the film. Check it out here: An excerpt from Nayanthara’s post read, “This is an all time low from you and speaks so much about your character. I wish you were half the person you portray to be on stage in audio launches in front of your innocent fans, but you …