What are the current methods firms use to reduce risks of data leakage in the enterprise information system?

What are the current methods firms use to reduce risks of data leakage in the
enterprise information system?

Analysis of Information System Security in the Healthcare Industry
1. What are the current methods firms use to reduce risks of data leakage in the
enterprise information system?

2. What are sources of risk to the current information systems?

3. What can researchers learn from past data leakages?