Board Thread:Support Requests - Getting Started/@comment-4059391-20200701045431/@comment-25358237-20200701052002

Let's say your wiki is on a video game (which it sounds like it is). If someone takes a photo of the protagonist and uploads it to their site, they have no legal right to prevent you from using it - the copyright lies with the concerned people (likely to be part of the game company). If it's a screenshot, or if they have composed an image in Photoshop (for example), then they void their legal rights as they have used someone else's designs.

Presumably, the same would occur with guidebooks. If they didn't make it, they can't stop you from using it. The only people that can stop you are the people with legal/moral rights.