When can an opinion be a crime? What are the limits to the freedom of expression? At what point does my freedom end because someone else’s begins? These questions have been raised in our times with an urgency that stems from the need to square the freedom of thought and of expression in public (nowadays on the social media as well) with the prevention of threats of whose danger and seriousness history makes us aware. On these clearly topical questions, the Spanish writer and journalist Francisco Alba and the Portuguese lawyer and criminologist Rui Patrício pen their ideas.