PostgreSQL 采用 PostgreSQL 许可证 发布，这是一种宽松的开源许可证，类似于 BSD 或 MIT 许可证。
PostgreSQL 数据库管理系统
（也称为 Postgres，曾用名 Postgres95）
部分版权所有 © 1996-2026，PostgreSQL 全球开发组
部分版权所有 © 1994，加利福尼亚大学董事会
Permission to use, copy, modify, and distribute this software and its documentation for any purpose, without fee, and without a written agreement is hereby granted, provided that the above copyright notice and this paragraph and the following two paragraphs appear in all copies.
IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS, ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATIONS TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
PostgreSQL 全球开发组致力于将 PostgreSQL 永久保持为自由开源软件。目前没有更改 PostgreSQL 许可证或以其他许可证发布 PostgreSQL 的计划。
如果您想了解更多关于此话题的信息，请查阅邮件列表归档中关于此主题的众多讨论。