Gadol, that would be a subset. I think information also need to be released and be harmful. In this case, public knowledge seems to be entirely due to DOJ act. interesting, that while this was an issue between maralago and national archives – there were no leaks… this helps narrow down where leaking is coming from.
Anyway, a lot of experts seem to say that there are novel issues here, possibly touched before in the case of Bush Jr verbally authorizing Libby to leak Iraqi info. Libby was not prosecuted for that, at the end, only for perjury.
Also, it seems that the letters from brother Kim mamash were part of items that Trump had and already returned to Archives. I wonder what is the purpose of secrecy here – these are written by NK president! Are we to keep them secret from Chinese or from NY Times?! Did Kim classify them and did he transmit them secure? Maybe he needs to be prosecuted also.