Answer:
Libel consists in imputing someone offensive to one's reputation, although it is not a crime, as is the case with slander. This is the case, for example, of an actress who has details of her private life exposed in a magazine.
In this case, even if the fact told is true, disclosing it is a crime. The only real exception is if defamation comes against a civil servant and the offense relates to the performance of his duties.