I'm saying that ISO standards have might have no bearing on copyrightablity of APIs, or enforcement of that copyright. Copyright was never intended to protect against use in any implementation like Oracle's argument for API copyrightablility here. The idea of copyright at the time was protection against strict copying of the same (or close enough) implementation, and therefore ISO standards don't really protect against copyright claims.

At the very best it's extremely grey area in the law.

ISO standards annoying are copyrighted with DRM (your pdf copy has your personal email in it, so they would know who shared it IIRC) — but have a policy that any patents must be disclosed and reasonably licensable.

IMO that’s not necessarily DRM, so much as just a watermark. Although one could argue they are using it to manage their rights digitally, hence DRM.