Not that it matters for more than a couple of players, but I assume anyone that was in the NBL before it merged with the NBA is available. The players were sort of just folded into the league and given to existing teams, but obviously weren't actually drafted (there is one guy who would absolutely be drafted that fits this bill). I also assume since the NBA has taken on the BAA history, the few BAA drafts will be considered NBA drafts for this purpose. Again there are only 3 drafts and it might not have anyone drafted from them, but want to make sure we are all on the same page. And I think we talked about keeping territorial picks out, but I don't know that we ever decided that for sure (again only a couple of guys would get drafted in this thing that were, but Wilt would potentially be a game changer in this if he was was available).
Maybe once we get closer in the draft or league thread, the commish can just list all of the ineligible players so we are all on the same page.