Namak Haram has been adopted from the English classic "Becket", released in early 60s. Two stalwarts of the yester era, Peter O Toole and Richard Burton acted as the two protagonists. Hrishikesh Mukherjee made the indianization of this film with time-tested convictions. Amitabh Bachhan did the Peter O Toole's role, while Rajesh Khanna did Richard Burton's character. Both gave brilliant performances and the roles amazingly fitted their images and characterstics.