Can I suggest a method of distributing this sensitive data?
Why not set up a very simple website using a CMS (Content Management System) like Joomla or Mambo? These systems have secure user databases built in and any number of 'admins' can authorise/deauthorise users to certain parts of the website.
The best part is systems like Joomla are free! I used it build our team website and it took me a about 20 hours to build in total and I knew nothing about how to build a website.