"Table Logic Data is that data, which when removed from the system, removes the logic from the data that remains."
The first question to ask yourself is, "do I really need all of the data to be available all of the time?"
Ask your people which details normally presented to them, is either irrelevant to their duties, or that they could do without if they had to. This exercise can be helpful in establishing database Views, and that in itself, would increase productivity and job satisfaction, giving a low level of security into the bargain.
A case in point: Do you recall my name and qualifications? If you do not then revisit the Preface. In either case, it is immaterial to you at this point, to know any more about me than what I have told you, and that knowledge has got you this far, and it does not preclude us from potentially having international communication on a subject of mutual interest.
Governments have put into legislation the security and privacy rights that we, as individuals, should expect from those in whom we trust the safe keeping of the details that we must give, in order to receive a service. The Web should provide a level of Anonymity which gives Us the right to authorize it to be otherwise, and so should your databases.