# Attribution and Licensing > Where every page on this site comes from, who holds it, which licence it carries, and where the complete notice is retained. --- LLMS index: [llms.txt](/llms.txt) --- doc.pg.center republishes documentation written by six upstream projects. Every documentation page carries a one-line credit at the end naming the work it is derived from, its copyright holder, its licence, and a link back to the section of this page that covers it. This page is that record. It states what was imported, when, from which pinned revision, under which licence, and where the complete upstream notice is retained. > [!NOTE] > doc.pg.center is an independent community documentation project. It is not affiliated with, endorsed > by, or an official publication of any of the projects below, nor of the PostgreSQL Global > Development Group. ## Summary {#summary} | Component | Upstream work | Pinned at | Licence | Retained notice | |---|---|---|---|---| | [Patroni](/docs/patroni/) | [Patroni documentation](https://patroni.readthedocs.io/en/latest/) | v4.1.5 | [MIT](https://opensource.org/license/mit) | [Upstream `LICENSE`](https://github.com/patroni/patroni/blob/master/LICENSE) | | [pgBackRest](/docs/pgbackrest/) | [pgBackRest documentation](https://pgbackrest.org/) | v2.59.3 | [MIT](https://opensource.org/license/mit) | [Upstream `LICENSE`](https://github.com/pgbackrest/pgbackrest/blob/main/LICENSE) | | [PgBouncer](/docs/pgbouncer/) | [PgBouncer documentation](https://www.pgbouncer.org/) | v1.26.0 | [ISC](https://opensource.org/license/isc-license-txt) | [Upstream `COPYRIGHT`](https://github.com/pgbouncer/pgbouncer/blob/pgbouncer_1_26_0/COPYRIGHT) | | [pgBadger](/docs/pgbadger/) | [pgBadger documentation](https://pgbadger.darold.net/) | v13.2, commit `a1ad95a` | [PostgreSQL](https://opensource.org/license/postgresql) | [`/third_party/pgbadger/LICENSE`](/third_party/pgbadger/LICENSE) | | [HAProxy](/docs/haproxy/) | [HAProxy 3.4 manuals](https://docs.haproxy.org/3.4/) | 3.4.6-66; stable v3.4.6, commit `16acce1` | [GPL-2.0](https://www.gnu.org/licenses/old-licenses/gpl-2.0.html) | [`/third_party/haproxy/LICENSE`](/third_party/haproxy/LICENSE) | | [etcd](/docs/etcd/) | [etcd v3.7 documentation](https://etcd.io/docs/v3.7/) | v3.7, commit `d20f8ae` | [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/) | [Upstream `LICENSE`](https://github.com/etcd-io/website/blob/main/LICENSE) | Every collection is **adapted**, not mirrored. Headings, anchors, cross-links, code signatures, page grouping, and navigation are reworked for this edition; the upstream prose itself is preserved. The page-end credit says so, and links to this site's change history for the page you are reading. ## Patroni {#patroni} Imported on 2026-08-15 from the [Patroni documentation](https://patroni.readthedocs.io/en/latest/) for **v4.1.5**. Patroni is copyright (c) 2025 Compose, Zalando SE, Patroni Contributors, and is distributed under the [MIT License](https://opensource.org/license/mit). The complete licence text is retained [upstream](https://github.com/patroni/patroni/blob/master/LICENSE). ## pgBackRest {#pgbackrest} Imported on 2026-08-15 from the [pgBackRest documentation site](https://pgbackrest.org/) and refreshed on 2026-10-13 to **v2.59.3**. pgBackRest is copyright (c) 2015-2026 The PostgreSQL Global Development Group and David Steele, and is distributed under the [MIT License](https://opensource.org/license/mit). The complete licence text is retained [upstream](https://github.com/pgbackrest/pgbackrest/blob/main/LICENSE). ## PgBouncer {#pgbouncer} Imported on 2026-08-15 from the [PgBouncer documentation site](https://www.pgbouncer.org/) for **v1.25.2** and refreshed on 2026-10-13 to [**v1.26.0**](https://github.com/pgbouncer/pgbouncer/releases/tag/pgbouncer_1_26_0). PgBouncer is copyright (c) 2007-2009 Marko Kreen, Skype Technologies OÜ, and is distributed under the [ISC License](https://opensource.org/license/isc-license-txt). The complete licence text is retained [upstream](https://github.com/pgbouncer/pgbouncer/blob/pgbouncer_1_26_0/COPYRIGHT). ## pgBadger {#pgbadger} Imported on 2026-08-15 from and from [`darold/pgbadger`](https://github.com/darold/pgbadger) at commit [`a1ad95a`](https://github.com/darold/pgbadger/commit/a1ad95a035a0c2d246fe632eb1c361d4bde0ddae), whose latest published release at the time was v13.2. pgBadger is copyright (c) 2012-2026 Gilles Darold and is distributed under the [PostgreSQL License](https://opensource.org/license/postgresql). The complete licence text is retained beside the offline examples as [`/third_party/pgbadger/LICENSE`](/third_party/pgbadger/LICENSE) and in `sources/pgbadger/upstream/LICENSE` in the site repository. > [!IMPORTANT] > pgBadger embeds a modified `SQL::Beautify` module under Artistic License 2.0, and its > generated-report resources include MIT, GPL-2.0, and SIL Open Font License 1.1 components. The > complete upstream resource inventory is retained as > [`/third_party/pgbadger/THIRD-PARTY-LICENSES`](/third_party/pgbadger/THIRD-PARTY-LICENSES). > The [sample reports](/docs/pgbadger/sample-reports/) published here are historical generated > artifacts and keep their original embedded notices. ## HAProxy {#haproxy} Imported on 2026-08-16, refreshed on 2026-08-30, and updated on 2026-10-13 with the official English HAProxy 3.4 maintenance snapshot `3.4.6-66`, commit [`16acce1dac1d`](https://git.haproxy.org/?p=haproxy-3.4.git;a=commit;h=16acce1dac1dcf1ad5d654204af3a5d45d0e3de8). The latest stable release is `3.4.6` (tag `v3.4.6`); the documentation snapshot includes maintenance-branch changes made after that release. The English prose is derived from the complete `doc/intro.txt`, `doc/configuration.txt`, and `doc/management.txt` manuals — 40,216 lines in total — reorganized into 34 reading pages. HAProxy is copyright 2000-2026 Willy Tarreau and is distributed under the [GNU General Public License version 2](https://www.gnu.org/licenses/old-licenses/gpl-2.0.html). HAProxy's own licence explanation, its OpenSSL exception, and the complete GPLv2 text are published as [`/third_party/haproxy/LICENSE`](/third_party/haproxy/LICENSE) and [`/third_party/haproxy/GPL-2.0`](/third_party/haproxy/GPL-2.0). > [!WARNING] > The HAProxy-derived pages are **not** covered by this site's CC BY 4.0 licence. They carry > HAProxy's GPLv2 terms. ## etcd {#etcd} Imported from the official etcd v3.7 documentation and refreshed on 2026-10-13 at commit [`d20f8ae346da`](https://github.com/etcd-io/website/commit/d20f8ae346da60ab6eb6f24f200753b328aa9fcc). The pinned source tree is [`content/en/docs/v3.7`](https://github.com/etcd-io/website/tree/d20f8ae346da60ab6eb6f24f200753b328aa9fcc/content/en/docs/v3.7). The etcd documentation is copyright 2013-present etcd Authors. Its prose is licensed under [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/), while code and code samples are licensed under [Apache 2.0](https://www.apache.org/licenses/LICENSE-2.0). The complete notice is retained [upstream](https://github.com/etcd-io/website/blob/main/LICENSE). ## This site {#site} Original text written for doc.pg.center is published under [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/), except where an upstream licence above applies to the page instead. The PostgreSQL elephant (Slonik) shown on the home page is the PostgreSQL project's own mark, taken from the [postgresql.org website repository](https://git.postgresql.org/gitweb/?p=pgweb.git) and republished here unmodified under [the PostgreSQL trademark and logo policy](https://www.postgresql.org/about/policies/trademarks/) as a reference to PostgreSQL. It is a mark of the PostgreSQL Community Association of Canada and its use here does not imply endorsement. The site is built with [OINK](https://oink.pgsty.com/) v1.2.0, a Hugo theme licensed under the [Apache License 2.0](https://www.apache.org/licenses/LICENSE-2.0), which carries its own upstream and bundled-dependency notices in the module source. Corrections to any attribution on this page are welcome through the [site repository](https://github.com/pgsty/doc.pg.center/issues).