I also doubt that Funcom’s IP claim would hold up if tested. The author is long-dead, the stories are almost 100 years old by now… hard to fathom how they’d argue exclusive rights to that.
That aside, legal rights to an IP do not, in my opinion, force the rest of the world to accept the rights holder’s creations as canon.
The law restricts how others can use the content. But it doesn’t force them to like it, buy it or accept it as canon.
If a rights holder manages to make a fandom follow their vision for the IP is a matter of persuasion, not law.
As many others, I do not “believe” in midi-chlorians. Sue me, George Lucas / Disney. Same is true for the Conan IP. The guys who made the Conan animated series probably had the rights to do it, but we still don’t have to accept it as canon.
Hoooowever, I think Funcom treated the IP very well so far. There was too much magic in Age of Conan, they filled a lot of gaps with their own inventions and used some non-Howard stories as well as the movies, even the non-Schwarzenegger one.
But I think it all fitted very well overall, and some concessions have to be made to make a fun game out of an IP.
I’m actually surprised how much they stick to the setting and atmosphere in some cases. I mean… come on, a game that encourages slavery? In this day and age? With human sacrifice, cannibalism, and even gasp nudity?
What I want to say: It’s some law that forces us to accept their content as canon, but overall, they’re good at making us believe that’s how Howard might have designed a video game. Okay, with a tad less ■■■■, but still, pretty close.