It was in September that the young people in agreement abused the man by hitting and kicking his head and body against a concrete floor.
The man must have been bound and blindfolded at the time.
Parts of the crime were filmed and in connection with this they took off the plaintiff's clothes.
Youth care
The beating continued after the man lost consciousness.
The 17-year-olds are convicted of serious assault and the penalty is closed youth care for eleven months and they must pay SEK 105,400 in damages.
The 16-year-old who was involved in the assault and was previously a suspect is acquitted.