Helmet Safety Standards Canada
Those are reasonable standards that will protect your head in an accident. Comparable to the Snell B-90 standards.  Snell B-95 standards is higher and would provide more protection.

ASTM F2040, for instance, is a "snow sports" helmet standard based on the same testing as the ASTM bicycle helmet standards with some additional cold-conditions tests added in.

Canada has its own bicycle helmet standard, CAN-CSA-D113.2-M.

You have to pay to get a copy of the actual standard, but this site has a nice comparison of helmet standards.


The Canadian and ASTM standards use similar flat and round anvils but ASTM has a curb/kerb anvil that the Canadian standard doesn't have. (ASTM is better here)
The Canadian standard has a more protective maximum acceleration


As far as the Canadian tort law part of your question, I don't think we can really answer that.