The link at the top of the repo goes to the product page, which says: >Postgres-BDR, an extension to PostgreSQL is free and open source licensed under the [sam

The link at the top of the repo goes to the product page, which says: >Postgres-BDR, an extension to PostgreSQL is free and open source licensed under the [same terms] as PostgreSQL. So it's under the PostgreSQL license, which is similar to MIT.