Rules applied on lichess

I always assumed without giving it much thought, that books and databases were allowed in correspondence games and engines weren't.
However yesterday I wondered if it was allowed to analyse the position with other players.
So I just looked in the "question and answers" section, but I'm more confused than before.
Concerning whether the help of another human player is allowed or not, it seems that the question hasn't been raised. Or at least I didn't see it.
It seems clear that the use of books and database is allowed, however, there are numerous questions about engines and no clear answer. Some say it is allowed, other say that it is not, and other say that it is allowed in the official rules but forbidden on Lichess. But it seems there are no published rules to back any of this up.
Anyway this led me to thinking that the "question and answers" was not a very appropriate tool. There are a lot of similar questions and the answers are contradictory and we don't know who to trust since none of these appear as the official Lichess answer.
My point is that the rules applied on Lichess, for correspondence games or any other form of chess, should be published somewhere, in a very accessible place.
This question for instance shows how confused people can be about that : lichess.org/qa/1922/what-are-the-rules-of-correspondence-chess-system

Also if anyone knows for sure what is the policy regarding human or engine help in correspondence chess, I'm interested.

ps : We can also see the use for published rules, when we see all the people complaining in the forum about losing on time against a player who has just a knight or a bishop.

Lichess's answer:
"Cheating is defined as using anything other than your own knowledge to play against another user, and gives you an advantage. This includes using computer engines on live games, using written chess materials on a live game such as opening books or endgame tablebases. Having another player give you advice on what to play will also be considered cheating. Exceptions are where the user is playing against the Stockfish engine, or against another player in a casual game with the opponent's consent. Lichess maintains the right to change these definitions as they see fit and to apply bans following the judgment of the administration team."

-ToS lichess.org/terms-of-service

Hope this helps!

Thanks. I suppose we have to agree to that when we register, but I just forgot. Anyway it would be nice to have a simple access to this article from the top menu I think.
I think it makes sense not to use tablebase and other players help but I'm stunned that we can't use books in correspondence games though.
For instance I'm playing a game where we reached a Maroczy bind / Hedgehog sort of position, so I started to read the books that I have that treats this structure. Does that make me a cheater ? This feels weird to forbid that in my opinion.
Also, we have access to an analysis board with Lichess database. Are we not supposed to use it ?

You can see the full rules regarding cheating here: lichess.org/qa/258/all-about-cheating-questions-and-answers

Thank you.
I still think these informations should be more easily accessible though. The official position of Lichess should not be lost in the middle of countless questions about cheating and contradictory answers. At least it should be stated somewhere that this is official and not some random post.

Regarding the contents, it states that in correspondence games, books are allowed but not "computers". Does that means we can't use databases ? If so, why do we have access to Lichess database in the analysis board ?
I must say that I have always used it and I always assumed that everybody did (though some of my opponents played nonsense in the opening).

It is kind of strange that lichess forbids so much in correspondence, while the ICCF allows it. Moreover, it is near to impossible to verify compliance for a correspondence game.

If using an opening book is classified as cheating, why do we have access to the opening book on the analysis board for correspondence games?

I assume (but cannot confirm) that for correspondence play, the Lichess Opening Explorer (game database) is fair game.

I hope that databases in general are permitted for correspondence use, as a) I think this is normal for correspondence and b) it's difficult to enforce a no-knowledge policy.