Advantages
PostgreSQL offers many advantages for your company or business over other database systems.
Immunity to over-deployment
Over-deployment is what some proprietary database vendors regard as their #1 licence compliance problem. With PostgreSQL, no-one can sue you for breaking licensing agreements, as there is no associated licensing cost for the software.
This has several additional advantages:
More profitable business models with wide-scale deployment.
No possibility of being audited for license compliance at any stage.
Flexibility to do concept research and trial deployments without needing to include additional licensing costs.