It's up to the companies themselves...

Easily sorted by all the companies concerned - if no-one cooperates then the whole thing is a non-starter. Everyone tells them to go to hell - end of problem. Might even help to estimate the cost of an audit and threaten to sue for it.

This isn't actually about copyright - it's about jobsworths who need to get a life rather than posturing from within their ivory towers and exceeding their almost non-existent authority. Increasingly this country seems to be given over to such people. I suspect they're cloned in a factory somewhere. Under full copyright of course...