A court-imposed publication ban muzzled most of the details of the trial, but the Winnipeg Sun said the "tubby, shaggy-looking man" entered the guilty pleas and said little else at the hearing.
The charges related to abuses of his daughter and step-daughter beginning when they were 9 years old in the home and continued until they were 16.
The Sun said police documents it saw before the publication ban indicated investigators found 67 videotapes and nine computer hard disk drives containing child pornography at the home.
"For all intents and purposes, the property was used as a studio to create hundreds of hours of child pornography," the investigators' report said.
Among the charges were two of sexual assault causing bodily harm, two of making child pornography and forcible confinement, the Sun said.
Prosecutors told the judge they intend to seek dangerous offender status when the man is sentenced, meaning he would be imprisoned indefinitely.
No sentencing date was immediately set.
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