The names of multiple Crown witnesses and the nature of their work had also been suppressed, as well as the country referred to in the charges.
Riordan rejected a request from the Crown that journalists covering the case be police vetted before hearing restricted information, stating that it would be dangerous constitutional territory.
Kristin Wilson, representing NZME and RNZ, had argued that harm the Crown sought to avoid wouldn't be addressed by police vetting the media.
Riordan said it could have large practical and constitutional consequences, and they would deal with "difficulties" on a case-by-case basis.
Riordan also said the trial, which was due to happen next month, would be delayed.