Police seized Pritchard's computer and found about 227,000 images and 2300 videos, although fewer than 5 per cent had been viewed. He had been chatting on the internet with a man in Ireland who was abusing a 12-year-old boy. Pritchard suggested the man perform a sexual act on the boy, then downloaded the images. The Irishman has also been arrested.
Mr O'Brien said the department had dedicated inspectors with the expertise to catch offenders and worked with police and Customs in New Zealand and Interpol in a concerted effort to catch those who manufacture, view or distribute objectionable images.
"In the 16 years we have been operating, we've established an international reputation for our work with like-minded law enforcement agencies. If you deal in this material you can expect to get caught," he said.
"No matter what you do, everything's traceable on your computer. People, who think they're safe in the confines of their own home indulging in this objectionable trafficking on the internet should think again and consider seeking psychological help."
Alan Bell, national director of child sexual exploitation prevention group ECPAT NZ Child Alert, welcomed the judge's tough sentencing, but said there was a lack of consistency in sentencing.
"Some of the sentences handed out to these paedophiles are not strong enough at times and don't act as a deterrent to other, similar offenders," Mr Bell said.
"We feel there should only be name suppression if the safety of the child victim is at risk, not to protect the offender. We want them named and shamed."