My thoughts precisely.
IP is not a strange, alien concept. It's been around in some form or another for nigh-on two centuries now. You can't just claim simple ignorance: if you're that thick, you probably shouldn't be running a pub at all.
The pub was in the wrong here. They took a massive gamble and damned near lost. That they managed to "win" this case with the aid of an equally ignorant internet crowd is just blind luck; legally, they didn't have a leg to stand on.
The law is very clear here: it is a legal obligation to protect a company's intellectual properties. The company lawyers don't get to pick and choose: if a violation comes to their attention, their default response is to sue for damages.
It's really not that hard to ask permission to use someone else's property. In my day, we called it basic manners.