The last bit of your middle paragraph could be right. Its a fuzzy grey area thats all.
Matt - let's say you were racing in any club event, officials may / might pull you out of the race due to wearing an helmet that doesn't comply with Aust / NZ standards (AS/NZS 2063) silver sticker
The Intellectual Property Rights (copyright) of the Standard may be owned by SAI Global, but as compliance with the Standard is mandated, it has the nature of subordinate legislation, similar to regulations and bylaws, and it should therefore be freely and readily available for perusal, as is any other legislation or subordinate legislation.
Currently the State Library has one licence for people to view Australian Standards, with copying and screen dumping disabled. As far as I know, this is the only free viewing of Australian Standards available in SA.