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About Vchord & vchord.pgsty.com

Project overview, licensing, upstream attribution, and trademark policy for the PGSTY-maintained Vchord extension suite and documentation site.

1: License
2: Attribution & Provenance
3: Trademark Policy

Vchord is a PostgreSQL extension suite for scalable vector similarity search and BM25 full-text search, consisting of vchord, vchord_bm25, and pg_tokenizer.

This repository (pgsty/vchord.pgsty.com) and website (https://vchord.pgsty.com/) provide a complete, fast, local-first documentation and technical blog reference for pgsty/vchord, pgsty/vchord_bm25, and pgsty/pg_tokenizer, maintained by PGSTY using the OINK 1.4.0 documentation framework.

Note

pgsty/vchord, pgsty/vchord_bm25, and pgsty/pg_tokenizer are PGSTY-maintained forks of tensorchord/VectorChord, tensorchord/VectorChord-bm25, and tensorchord/pg_tokenizer.rs. See Attribution and Trademark Policy for details.

Documentation Scope

Section	Coverage
`vchord` Docs	Installation, migration from `pgvecto.rs`, `vchordrq` and `vchordg` indexing, MaxSim multi-vector retrieval, range queries, PostgreSQL tuning, external index precomputation, benchmarks, and SQL reference.
`vchord_bm25` & `pg_tokenizer`	Complete documentation for `pgsty/vchord_bm25` (`vchord_bm25`) and `pgsty/pg_tokenizer` (`pg_tokenizer`): Okapi BM25 scoring, Block-WeakAnd Top-K index scans, prefiltering, hybrid search with `vchord`, multilingual text analyzers (`jieba`, `lindera`, Snowball, HuggingFace), and SQL/GUC reference.
Engineering Blog	All 37 engineering deep-dives, benchmark analyses, hybrid search tutorials, and release announcements.

1 - License

Software and documentation licensing for Vchord (pgsty/vchord, pgsty/vchord_bm25, pgsty/pg_tokenizer) and vchord.pgsty.com.

Software License (`pgsty/vchord` & `pgsty/vchord_bm25`)

pgsty/vchord and pgsty/vchord_bm25 are licensed under the GNU Affero General Public License v3.0 (AGPL-3.0-only):

pgsty/vchord LICENSE
pgsty/vchord_bm25 LICENSE

Software License (`pgsty/pg_tokenizer`)

pgsty/pg_tokenizer is licensed under the Apache License 2.0 (Apache-2.0):

pgsty/pg_tokenizer LICENSE

Documentation License (`vchord.pgsty.com`)

The documentation and site adaptations in pgsty/vchord.pgsty.com are licensed under the Creative Commons Attribution 4.0 International License (CC-BY-4.0), with upstream materials adapted from tensorchord/pgvecto.rs-docs and blog.vectorchord.ai.

The site theme, OINK v1.4.0, is licensed under Apache License 2.0 (Apache-2.0).

2 - Attribution & Provenance

Upstream sources, copyright notices, and modification records for vchord.pgsty.com.

vchord.pgsty.com is maintained by PGSTY to provide a comprehensive, searchable documentation and engineering reference for the Vchord extension suite (vchord, vchord_bm25, and pg_tokenizer).

Upstream Sources

Documentation (content/docs/, content/cloud/, content/pgvecto-rs/)
- Source Repository: https://github.com/tensorchord/pgvecto.rs-docs
- Original Site: https://docs.vectorchord.ai/
- Copyright: © 2023–Present TensorChord Inc. and Contributors.
- Adaptations: Converted from VitePress to Hugo + OINK v1.4.0, including GitHub-style callout normalization, KaTeX math delimiter standardization, internal link resolution, and structural navigation metadata.
Engineering Blog & Release Notes (content/blog/)
- Original Publication: https://blog.vectorchord.ai/
- Copyright: © 2023–Present TensorChord Inc. and respective article authors (Keming, Haze, VoVAllen, Yifanwang, Kolkri, Gin, Scase).
- Adaptations: Archived into content/blog/post/ and content/blog/release/ with original publication dates, author metadata, and direct upstream_link provenance pointers.
Vchord Extension Suite (vchord, vchord_bm25, and pg_tokenizer)
- vchord (pgsty/vchord) Forked From: https://github.com/supervc-stack/VectorChord (formerly tensorchord/VectorChord)
- vchord_bm25 (pgsty/vchord_bm25) Forked From: https://github.com/supervc-stack/VectorChord-bm25 (formerly tensorchord/VectorChord-bm25)
- pg_tokenizer (pgsty/pg_tokenizer) Forked From: https://github.com/supervc-stack/pg_tokenizer.rs (formerly tensorchord/pg_tokenizer.rs)
- Predecessor Project: https://github.com/tensorchord/pgvecto.rs

Page-Level Provenance

Every documentation page and blog post derived from upstream material declares upstream_link in its front matter. OINK renders this provenance link in the page footer alongside modification indicators.

3 - Trademark Policy

Statement of independence and nominative trademark usage on vchord.pgsty.com.

Statement of Independence

pgsty/vchord and vchord.pgsty.com are maintained by the Pigsty community. Neither pgsty/vchord nor vchord.pgsty.com is affiliated with, endorsed by, or sponsored by TensorChord Inc.

Third-Party Trademarks

VectorChord, pgvecto.rs, and TensorChord are names and marks associated with TensorChord Inc. They are used on this site solely for nominative fair use to identify the upstream open-source projects, extension names (vchord, vectors), SQL access methods (vchordrq, vchordg), and historical engineering articles.
PostgreSQL and Postgres are registered trademarks of the PostgreSQL Community Association of Canada.
Linux is the registered trademark of Linus Torvalds in the U.S. and other countries.
Amazon Web Services (AWS), Cloudflare, Docker, and other product or company names referenced in benchmarks and deployment guides are trademarks of their respective owners.