Need to create a highly secured database

Hello I'm looking to create a database. Here's the specs : - There will be a small number (20-30) of large records (lots of fields). - This will be highly secure. There should be a table with every user and authorized level. Users will be identified by login and/or password. Some will have access to all records, some will have access to a limited number of records. Within these records some information will not be available to all levels. For each file, access control will be coded by organization (departments, administration) and level (salesman, middle management, top management). The access control should, of course, be easy to modify and maintain. I'm either looking for a database software that has these access control features built-in or for some sort of plug-in for an existing database product. Our company is currrently using Access but this database will run on a NT server for Intranet use and queries will be made through HTML so this is not an issue. If someone has a similar experience, please contact me. Renaud Laffont baker@lac.gulliver.fr