A question about a book...

[Mudbill]

If you write it so that it influences SOMA but isn't strictly declared as the same thing, I don't think anyone can prosecute you for it. By leaving out the details that explicitly connects your story to theirs, it could always be something completely unrelated (lore-wise) and just happens to be 2 similar ideas. Easter eggs seem to travel through different companies and products freely.

I once read that no one can copyright an idea.