Via the NY Times:
[T]he Vatican confirmed the authenticity of a 2001 letter written by a top cardinal, Darío Castrillón Hoyos, praising a French bishop who was jailed for three months for not reporting a pedophile priest to civil authorities.“I rejoice to have a colleague in the episcopate who, in the eyes of history and all the other bishops of the world, preferred prison rather than denouncing one of his sons, a priest,” the letter to the bishop, Pierre Pican, read. The letter was first published on the French Catholic Web site Golias.
The Vatican confirmation was unusual because it cast an important cardinal in a bad light.
Now retired, Hoyos formerly served in Rome as Prefect of the Congregation of the Clergy and President of the pontifical commission Ecclesia Dei, an initiative which works to reconcile traditionalist Catholics back to Vatican authority.