Albert Ronald Heidke, 77, will be released from a Queensland jail on Thursday.
He was incarcerated in 2010 for 41 offences against four boys over 35 years.
Three of the victims were brothers whose parents were friends with Heidke.
He will be supervised and is banned from contact with children and play areas.
A 77-year-old sex offender who is a serious danger to the community will be released from jail in Queensland.
Albert Ronald Heidke is banned from having any contact with children under the age of 16 and cannot enter public parks or shopping centres without permission.
Heidke pleaded guilty in a Rockhampton court in 2010 to 41 offences against four boys committed over more than 35 years from 1973.
Of those offences, 31 involved three brothers, starting from when the boys were aged nine or ten.
Heidke's friendship with the boys' families had provided him with the opportunity to offend, said Brisbane Supreme Court Justice Martin Burns.
He said Heidke used 'quite sophisticated grooming behaviour' and, on some occasions, 'considerable force to restrain the boys'.
Heidke served a head sentence of 11 years' jail and has been refused parole twice for posing 'an unacceptable risk of further offending'.