Film director Bahman Ghobadi challenges Iran’s draconian censorship and pays tribute to the country’s underground rappers and rockers in his new film shown in the Cannes film festival on Thursday. Ghobadi’s “Nobody Knows About The Persian Cats” tells the story of two young Iranian musicians trying to put together a band and play in European festivals after being released from jail. On Thursday, the movie opened “Un Certain Regard,” a section of Cannes spotlighting new and upcoming talent.