Further reading in the PostgreSQL documentation

1. Roles and Database Privileges
2. Managing Privileges (DDL privileges)
3. GRANT and REVOKE (SQL commands)
4. Client Authentication (pg_hba.conf)
5. Authentication Methods
6. Server Configuration Parameters (postgresql.conf)

Further reading for Anonymization algortimes

1. k-Anonymity: a model for protecting privacy
2. ℓ-Diversity: Privacy Beyond k-Anonymity
3. t-Closeness: Privacy Beyond k-Anonymity and ℓ-Diversity

Privacy breaches

1. AOL User 4XXXXX9: Anonymizing Query Logs

2. How to Break Anonymity of the Netflix Prize Dataset
3. Simple Demographics Often Identify People Uniquely