[Koha] Restricting access to metadata for sensitive documents / biblios

Hi folks, I want to implement a Koha solution that restricts access to metadata for sensitive internal documents only to registered users. The records should be indexed but only registered users should view the complete biblio. I am thinking of running two Koha instances on one server, but there could be better ideas out there. I will really appreciate any ideas here. Thanks Benson Mugambi Sent from Yahoo! Mail on Android