'There was a very liberal regime in Charenton, run by a monk, and de Sade was smuggling his manuscripts out through a laundry girl. The nation was appalled by the filth he was writing, so Napoleon sent a very severe doctor, Royer-Collard, whom I play, to take over the asylum. He couldn't murder a member of the aristocracy so he took de Sade's pens - his quills - away. But then he started writing on his suit and on the walls with his own blood and excreta, or dictating his ideas to the other inmates. They couldn't stop him. The film is really to do with the freedom to write, no matter what it is. He's played by Geoffrey Rush and it's an extraordinary performance, even though he's a bit on the thin side because when the Marquis de Sade was in Charenton he weighed only 400lb!'