The most important evidence is the two-hour-long film which, among other things, shows how several men have sex with a woman who is heavily intoxicated and blindfolded.
Three of the men have been identified, and the work of trying to identify the others who also appear in the film is still ongoing.
The three identified men were prosecuted and brought to justice a few weeks ago.
"Voluntary"
According to police and prosecutors, they have raped the woman, while the trio, for their part, deny the crime and say through their defenders that everyone who participated in what happened in front of the camera - including the woman - participated voluntarily.
The three suspects are from Gävleborg, Dalarna and Västernorrland.
Two of the men were released after the trial while the man from Gävleborg is still in custody.
Everyone denies the crime.