When I saw a reference to this thread in the YKYASW thread I thought that you were talking about coppermind as in the wiki, and I was quite confused . But now I understand, and I would think that it would be the same as using notes on a test. On some tests where notes are allowed I say it would be legal, but on something like jeopardy I think it would be cheating.
In reference to what @Nameless was saying about copperminds being the same as long term knowledge, I disagree, because a lot of the time you learn facts in order to understand processes, and make connections that go deeper than just being able to rattle off facts, and I don't think that copperminds could give you that deeper understanding.