Zuli ProxyBroker Extended
Copyright 2026 Zuli2021 — modifications to this distribution

Zuli ProxyBroker Extended is an independently maintained derivative of the
upstream project proxybroker-rs (<https://github.com/TurtIeSocks/proxybroker-rs>).
Zuli claims only modifications to this distribution and does not claim
authorship of the upstream project. Original upstream copyright, attribution,
license notices, and prior statements of change remain preserved below.

Evidence-supported changes introduced by Zuli2021 in 2026 include:

  1. Distribution identity. The Cargo package is
     zuli-proxybroker-extended; the Rust library crate and CLI executable
     remain proxybroker.

  2. Proxy-pool and tunnel behavior. Initial proxy-pool fill concurrency and
     retry limits are configurable. Relay negotiation for HTTPS-capable
     upstream proxies used by HTTP CONNECT and SOCKS5 frontends was corrected
     to use opaque tunnels, a design intended to preserve client-owned
     end-to-end TLS.

  3. Focused automated tests cover pool-fill controls, CLI parsing, defaults,
     and relay-protocol selection.

  4. Distribution governance. Automatic crates.io publication was removed
     pending separate approval. The installer was retargeted to Zuli, made
     fail-closed for mandatory SHA-256 verification, and changed to retain
     LICENSE, NOTICE, and LICENSE-DATA. Release workflow logic was hardened
     for concurrency, publication ordering, stable/prerelease handling, and
     the GHCR latest-tag policy.

  5. Current-project README and mdBook documentation were migrated to the
     Zuli identity while preserving upstream provenance and historical records.

For engineering traceability, modified source files retain file-level
modification notices where established, while non-source distribution changes
are recorded in this NOTICE and the repository's Git history. Original upstream
notices remain preserved.

================================================================================

proxybroker-rs
Copyright 2026 proxybroker-rs contributors

This product includes software developed as part of ProxyBroker and ProxyBroker2:

  ProxyBroker
  Copyright 2015-2018 Constverum <constverum@gmail.com>
  https://github.com/constverum/ProxyBroker

  ProxyBroker2
  Copyright 2018-2025 BlueT - Matthew Lien - 練喆明 <bluet@bluet.org>
  https://github.com/bluet/proxybroker2

Both are licensed under the Apache License, Version 2.0.

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STATEMENT OF CHANGES (Apache License 2.0, Section 4(b))
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proxybroker-rs is a derivative work: a rewrite of ProxyBroker2 (Python 3 /
asyncio) into Rust (tokio). It is not a copy, a translation, or a binding. No
Python source is redistributed. The following changes were made relative to the
original work:

  1. Language and runtime. Python 3.10+/asyncio replaced by Rust/tokio. All
     source was rewritten. Program structure, protocol handling, provider list,
     and the observable behaviour of proxy discovery, checking, and serving are
     derived from the original.

  2. Geolocation data. The original bundles MaxMind's GeoLite2-Country database
     inside its distributed package. proxybroker-rs does NOT redistribute any
     MaxMind data. It bundles DB-IP Country Lite instead (see LICENSE-DATA), and
     supports a user-supplied database path. See docs/systematic-refactor/
     research.md for the analysis behind this change.

  3. Public API. The Python API (Broker, Proxy, Judge, Provider, Checker,
     Server, ProxyPool and the provider_utils helpers) was redesigned to be
     idiomatic Rust rather than transliterated. Behavioural parity is the goal;
     API-shape parity is not. Deliberate behavioural deviations are recorded in
     docs/systematic-refactor/map.md.

  4. Provider registry. Providers whose domains no longer resolve as of
     2026-07-15 were not carried over. Providers are expressed as data
     (configuration) rather than as subclasses.

  5. Bug fixes. Defects identified in the original during the port are fixed
     rather than reproduced. Each is recorded as a deviation in
     docs/systematic-refactor/map.md.

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THIRD-PARTY DATA
--------------------------------------------------------------------------------

When built with the "geo-bundled" feature (enabled by default), this product
includes the DB-IP Country Lite database:

  IP Geolocation by DB-IP (https://db-ip.com)
  Licensed under the Creative Commons Attribution 4.0 International License
  (CC BY 4.0). See LICENSE-DATA for the full terms.

Build with --no-default-features, or with default-features off and without the
"geo-bundled" feature, to exclude this data entirely.