Three magistrates at a federal tribunal unanimously agreed to reverse the suspension in the "social interest," legal authorities said in a statement.

Almost one million people have seen the movie since its Mexican release on February 18, and it is already the most successful documentary ever shown here, after winning a string of awards at international festivals.

The temporary suspension provoked accusations of censorship and criticism across the political divide.

But the rulings are temporary until the courts can hold a full hearing on a complaint from the film's main featured witness, who has argued he had not given permission to be filmed and that the screenings had affected his private life. A court session was set Friday on the case.

The film, by lawyers Roberto Hernandez and Layda Negrete, documents the retrial of street vendor Antonio Zuniga, who was serving a 20-year sentence for a murder he knew nothing about.

It provides a rare peek into Mexico's closed court system, where trials mainly take place on paper and the accused have to prove their innocence.