A new documentary about pedophile priests is shaking mostly Catholic Poland, eliciting an apology by the church hierarchy and prompting one priest to leave the clergy.

"Tell No One" was released on YouTube on Saturday and by Monday had 7 million views.

After the premiere, the primate of Poland thanked the film's creators, brothers Tomasz and Marek Sekielski, for their "courage." Archbishop Wojciech Polak said: "I apologize for every wound inflicted by the people of the Church."

The film reveals that a priest convicted of abuse, Dariusz Olejniczak, was allowed to continue working with young people. On Sunday he resigned from the priesthood.

Poland's Church authorities said in March that they had recorded cases of 382 clergymen who abused 625 victims under the age of 18 since 1990.