This is one of those standards I wish we could just unlock as free. We are surrounded by these symbols due to their obvious utility, to the point where I routinely see them used unknowingly on things that cannot possibly be legal given the copyrights inherent in the original source material, yet because many people not working in an industry that comes across such standards documents as part of standards compliance..…
> given the copyrights inherent in the original source material It's not obvious to me that (under US law) these are copyright protected. It may be a similar case as typefaces vs. fonts. The language on the ISO website suggests, at least to me, that you are paying for particular files in particular formats and are not licensing a protected symbol. Also the language in the ISO standards describes abstract symbols, and…
If you are producing warning signs for selling you might want to buy it to get the true colour data etc.