Jag tror att du kanske talar om anpassningen av Svårt att vara en Gud . Jag har inte kunnat hitta en bra sammanfattning av 1989 års anpassning, men Wikipedia-artikeln för 2013-remake täcker de höga punkterna och boksidan som jag länkade ovan nämner tryckpressen.
A group of 30 scientists travel from Earth to a nearly-identical alien planet that is culturally and technologically centuries behind. The inhabitants of this planet have brutally suppressed a renaissance movement, murdering anybody they consider to be an intellectual, and thus the planet is stuck in the middle ages. Anton, one of the scientists from Earth, is sent to infiltrate the local populace of the Kingdom of Arkanar and help them progress as a society, although he is forbidden from getting involved with local politics or forcibly interfering with the advancement of technology or culture. He assumes the identity of Don Rumata, a nobleman who resides in a large castle surrounded by poverty. There, he lives with Ari, a young woman whom he has taken as his bride, and the juvenile prince of Arkanar. Rumata's presence divides local opinion; some treat him as a God, others despise him.
Trailer
Hittade via söktermer av filmmedeltida planets tortyrtryck (inte min första uppsättning söktermer, med rätta)