Notice of claimed copyright infringement
A quick Google search says that [copyright enforcement representatives] rely on people settling for low dollar amounts ($400-$1000) rather than going to court. But because Canadian ISPs won't provide the IP owner's info without a court order, [copyright enforcement representatives] would then need to file a court order. Alternatively, they can get the person's info when the person accesses the settlement URL with their unique login and password. Don't contact them and they won't know who you are, but this assumes that [copyright enforcement representatives] actually does hope for settlements rather than going to court.
Also, I'm surprised that I'm not finding much on this on Google. I guess Canadians really did stop all the downloading.
The copyright enforcement representatives, law firm, email are legit. A quick Google search shows that Americans have been receiving the same notices for a while. It's just that I've only been able to find one other instance of a Canadian receiving the notice which surprises me.
The settlement offer has a expiration date. But the URL, login and password are unique and clicking the link would tell the [copyright enforcement representatives and law firm] that I read their email and they would have my IP.
VPN users are receiving notices as well, but the specified IP is their VPN IP. But the VPN provider is forwarding these notices so I don't know how that would work.