So Canada doesn't require that any DMCA complaints be filed under penalty of perjury, or any other mechanism to require them to be valid?
I'm very sorry for Canadians that they are vulnerable to harassment through this method. I suggest they consult with their government representatives on it.
They should also include the right to file a counter-notice, if it's not there already.
Frankly, I see that problem as one with the government, not one with your ISPs. Of course, my experience with most ISPs is that they ignore your average notice, and make an effort to avoid actually doing anything.
Canada does not have a notice-and-takedown system on the law books. Even the recent attempts to introduce a law like the DMCA in Canada did not include a notice-and-takedown system. There was a notice-and-notice system included in at least one of the proposed bills. Notice-and-notice would basically mean that the ISP forwards the email to the alleged offender.
There is no requirement for an ISP in Canada to immediately take down alleged infringing material. They may investigate on their own if they wish.