I could be wrong but I guess it somehow is teaching him something his guardian didn’t approve of. If it makes it easier think of it as you tutoring someone for math and they have strict parents and then you giving the kid a porn mag, them finding out And firing you.(not saying you did any of this ofc just an example)
In my opinion, they’re just making this a huge deal bc they are corrupt. They purposefully have not been teaching the king properly and his tutor is incredibly disrespectful to the king, which is the whole reason Alicia gave him that book in the first place- so he can actually learn how to be a king. I think they want him to be a puppet king who they control and Alicia is in the way of that bc she actually cares about her brother. They’re just using the fact that she gave him the book and the strictly written law that says only the king’s guardian can decide what he learns to get rid of her.

Okay maybe I'm stupid but I'm confused. Why is this book such a problem and why is everyone making a big deal out of it? I'm just so confused xD