If his archive was automated it's basically guaranteed he's saved a fair bit of loli content. Not sure of the legality in Canada, but this is seems like a case where they'd railroad you for something they normally don't enforce, e.g., Chris Handley in the states.
CP would not be unlikely even if he just archived "safe" boards like /a/, /tv/, and /g/.
If he's scraping the softcore or hardcore boards (because nobody's archiving 4chan for its intellectual discussions), he's absolutely going to have more than a few under-18 subjects in there doing sexually explicit things. If the state can verify the age and identity of any of them, he's toast.
>nobody's scraping 4chan for its intellectual discussions
You'd be surprised. There's quite a few archives out there just for keeping up board history and discussions.
>because nobody's archiving 4chan for its intellectual discussions
There's plenty of good discussion as long as you stay away from /b/, /v/, and the porn boards.
/diy/ always has interesting projects. /g/ seems to be the one tech board on the internet that takes consumer privacy seriously (Even HackerNews seems to give Microsoft a free pass in this regard)
CP would not be unlikely even if he just archived "safe" boards like /a/, /tv/, and /g/.