Simon David North has been handed a life sentence for repeatedly raping a girl and possessing thousands of indecent images of children and babies, some including animals.
North will serve a minimum term of nine years before he can be assessed for release on parole.
Judge Michael Stokes QC, who sentenced him at Nottingham Crown Court on November 10, described North's actions as a "campaign of rape" against the girl over a period of six years.
He imposed the life sentence on the rapes and concurrent prison sentences on a catalogue of other charges.
And he ordered North to sign the sex offenders' register and referred the case to a barring agency to ensure North never works with children.
"I have difficulty remembering a worse case of sexual abuse of an innocent little girl as this one," said Judge Stokes.
North's depraved background only came to light when American police tipped off British detectives about him after they had been monitoring images in an internet chat room.
Police attended North's home in Fosse Court, Farndon, and arrested him.
They seized his laptop and found 2,566 indecent images of girls.
He said to officers, before they found his hoarde, "there may be a few on my laptop", the court heard.
More than 1,300 images were of children aged between four months and 14 years involved in sexual activity, and six were of extreme porn.
North, 46, who had no similar previous convictions, had filmed two young girls in a bedroom taking photos of themselves and watching pornography.
The 43-minute video was found on his laptop and raised concerns amongst officers at the "overtly sexualised behaviour" of one of the children, the court heard.
Police learned North had repeatedly raped the child since the age of four.
Dawn Pritchard, prosecuting, said the defendant posed a significant risk, his behaviour had progressed to him encouraging other sexual activity involving other young girls.
North was initially shocked at the allegations and denied touching the rape victim, who cannot be identified, sexually.
But at court last week he pleaded guilty to six rapes, sexual assault, two charges of causing or inciting a child to engage in sexual activity, making and possessing indecent photos and possessing extreme porn.
He has since claimed he cannot remember what happened following a road accident in 2003, where he suffered massive skull injuries and part of his face was rebuilt.
But Judge Stokes said: "I don't believe that for one moment. This is an attempt to minimise the depths you have sunk to to behave in this way."
