A paedophile from Loughborough has been given an indeterminate sentence after admitting 11 counts of downloading and owning indecent images of children.
Joy was told he would only be released when no longer a danger
David Joy, 66, had campaigned for the age of consent to be lowered.
Police raided his squalid flat on Great Central Road in January last year and found 947 indecent images on computer discs as well as paedophile magazines.
The judge at Leicester Crown Court said he must serve at least 18 months before being considered for parole.
Sentencing him, Judge Michael Pert QC said given Joy's beliefs, that day "may never come".
Joy was a member of the Paedophile Information Exchange (PIE), an international organisation of people who trade obscene material.
PIE made national newspaper headlines in the early 1980s when members faced charges of publishing and sending articles through the post.
On January 24 last year, as part of coordinated raids on the remaining members of PIE, officers from Scotland Yard's Paedophile Unit swooped on recluse Joy's one-bedroom flat.
The property was so untidy officers had to climb around rotting piles of newspapers, rubbish and clutter, the court heard.
Scotland Yard detectives described how it took eight days to clear the flat, with officers suffering fleabites during the process.
Several of the images were in the very worst "level 5" category, which includes sadism.
Detective Constable Richard Morgan, of Scotland Yard's Paedophile Unit, said Joy's conviction was "last piece in the jigsaw" in dealing with PIE.