Christopher Priestley, 52, produced a paedophile guidebook and had more than 30,000 indecent images of children.
A paedophile has admitted writing a guide to preying on children and having more than 30,000 indecent images.
He also pleaded guilty at Sheffield Crown Court on Wednesday to amassing 30,886 indecent images of children. The National Crime Agency said he attempted to hide his offending behind "extremely high levels of encryption" on his laptop, desktop computer and external hard drive. Laura Scott, of the NCA's National Cyber Crime Unit, said: "Priestley sought out and downloaded an astounding haul of child sexual abuse material.
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