Many of the acts featured in the electronic files are too graphic to be described.

One of the victims, whose abuse photos had been circulated online, was from the Netherlands and had been abused by a family friend between the ages of 8 and 13, court documents revealed.

Another girl, known as ''Tara'', was the subject of an FBI investigation in 2006, which uncovered a worldwide child sex abuse ring.

During the course of her four-year ordeal, which began at the age of 5, Tara was forced to engage in a horrific variety of sex acts, sometimes with a knife held to her throat.

The FBI arrested her father in the state of Georgia in 2008 but 10 years later, the depraved photos were still being spread online.

Judge John Macdonald yesterday said he had planned to sentence Ebdell, a first offender, to home detention.

However, he was persuaded otherwise by defence counsel Sarah Saunderson-Warner, who said such a punishment would effectively end her client's automotive studies.

The judge said that would be a ''reasonable setback'' for someone so young and noted Ebdell was considered motivated to attend rehabilitative programmes.

The teenager was sentenced to six months' community detention and 15 months' intensive supervision, the terms of which barred him from possessing internet-capable devices or associating with anyone under 16.

Ebdell was also banned from driving for six months for doing ''donuts'' in a South Dunedin car park while on bail.