If he hadn’t handed out the book at work, I think he’d have a slam-dunk case. But if his doing that violated some sort of policy, and if the policy itself was not patently illegal, his case might be in jeopardy.
It’s my understanding and recollection that he only gave the book at work to those who specifically requested a copy. I don’t have time for a bunch of searching right now by you’re welcome to proceed to do so.