Prolific British paedophile Richard Huckle has been given 22 life sentences - to serve a minimum term of 25 years - for abusing up to 200 Malaysian children
The 30-year-old from Kent, had previously pleaded guilty to 71 sexual offences on young children, mainly in Malaysia but also in Cambodia from 2006 to 2014.
Twenty-three children were identified in 71 charges, although Huckle's tally of abuse on a so-called "Pedopoints ledger" was much higher.
Judge: Huckle's "self-delusion knows no bounds"
Sentencing, Judge Peter Rook QC told Huckle his "self-delusion knows no bounds" and a 60-page paedophile manual he had written was a "truly evil document".
"You were and are sexually obsessed with children. You have spent years abusing them. In one of your postings you stated that you had become consumed by your paedophilia."
The judge also suggested that the scale of Huckle's crimes could be far far worse, due to him not revealing the password of a heavily encrypted file on his computer where further photos and indecent images are believed to be stored.
The youngest of Huckle's victims was just six-months-old, while the oldest was only 12-years-old.
The freelance photographer had masqueraded as a devout Christian and English teacher to gain access to up to 200 children in Kuala Lumpur.
In one incident, he took a victim for a day out to celebrate her 5th birthday and sexually abused her at his house.
In online posts, Huckle had boasted: "Impoverished kids are definitely much easier to seduce than middle-class Western kids."
Commenting on one of his victims, he said: "I'd hit the jackpot, a 3yo girl as loyal to me as my dog and nobody seemed to care."
How one of Britain's worst paedophile's was caught
Huckle was a user of a now defunct paedophile site called The Love Zone which was being investigated by a joint police taskforce in Australia and Europe.
He specifically came to their attention after sharing a stream of pictures and videos of his rapes and assaults on children.
Huckle even tried to make a business out of his horrifc crimes by crowd-funding the release of the images.
By using data gathered from the site and information he had posted on social media and other internet sites, they identified who Huckle was and where he lived.
He was arrested by National Crime Agency officials at Gatwick Airport in December 2014 after they were tipped off by international task force.
More than 20,000 indecent images found on computer
Huckle, who studied IT at university in Malaysia, refused to give officers the passwords to his encrypted computer, but they were still able to uncover more than 20,000 indecent images of children.
He had refused to answer officers' questions, but the next day his mother asked him about the allegations and he admitted he had sex with children aged between three and 13.
'Upset' parents supported their son's prosection
After Huckle's admission to his mother that he had abused young children, his parents were so upset they contacted the police themselves.
During his trial, prosecutor Brian O'Neill QC said: "His mother was both extremely upset and extremely angry. She and his father called the police and asked them to take their son away.
"Both have made witness statements in support of this prosecution."
NCA: Huckle abused trust "in the worst possible way"
James Traynor, from the NCA's Child Exploitation and Online Protection command, said Huckle abused the trust of the community in which he lived.
Richard Huckle spent several years integrating himself into the community in which he lived, making himself a trusted figure. But he abused that trust in the worst possible way. He deliberately travelled to a part of the world where he thought he could abuse vulnerable children without being caught.
"Borders are no barrier - we are determined that those who go abroad to abuse children will be held to account, " Mr Traynor added.