PostgreSQL License

The open source license used by the PostgreSQL project

PostgreSQL is released under the PostgreSQL License, a liberal Open Source license, similar to the BSD or MIT licenses.

Originally PostgreSQL was released under a license similar to, but not identical with, the BSD license. However in 2009 RedHat decided to label it as a MIT license [1], which it is also not, and controversy ensued. The issue was resolved by applying to the Open Source Initiative (OSI) for recognition of the existing PostgreSQL License as a separate license, which was granted in 2010 [2][3].

Some other PostgreSQL projects such as pgAdmin are also released under the PostgreSQL License.