This is textbook copyright infringement. $150k statutory damages plus, at the court's discretion, legal costs and fees. And that is just the result of civil action. You could probably find a prosecutor who would love pursue criminal action against the conference to appear strong on cybersecurity.
There is a reason why even large corporations, which often play chicken with lesser laws, are extremely careful about copyright infringement. The law has real teeth if the infringer has significant wealth.
