A week after the murderous assault on its offices the French satirical magazine Charlie Hebdo is back. Defiant. With another image of the Prophet Muhammad on its front cover and an extraordinary print run of three million. The debate about freedom of expression, rights and responsibilities continues in the face of terror. Flemming Rose is the Danish editor who commissioned cartoonists to portray the Prophet in his Copenhagen newspaper in 2005. He's lived with death threats ever since. Stephen Sackur asks what, if anything, has changed in the past decade?