Earlier quoted context omitted.
Canada currently uses a "notice and notice regime" [0], meaning the rights holder notifies the ISP, who turns around and forwards the notice to the infringing customer, but does not give the rights holder the account information, nor do they take any punitive action towards the customer. However, the ISP must retain historical data on these notices, so if in the future the laws change, rights holders could in theory…
>if in the future the laws change Almost no legal system works this way. You can't suddenly be found guilty of violating a law that didn't exist.
(it took a while to pass the law, and was a multi-party, multi-year process)