LICENSE-THIRD-PARTY

# Third-Party License Compliance

This file documents third-party dependencies used by common_system and provides
a reference for the kcenon ecosystem's SOUP (Software of Unknown Provenance)
licensing obligations.

For the full ecosystem-wide SOUP inventory, see `docs/SOUP-LIST.md`.

## common_system Dependencies

common_system has no core third-party dependencies. Testing dependencies
(gtest, benchmark) are not distributed with production binaries.

## Ecosystem-Wide Third-Party Licenses

The following licenses apply to SOUP components used across the kcenon
ecosystem. All are compatible with the project's BSD-3-Clause license.

### MIT License

**Applies to**: fmt, spdlog

```
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
```

- fmt: Copyright (c) 2012-present, Victor Zverovich and {fmt} contributors
- spdlog: Copyright (c) 2016 Gabi Melman

### Boost Software License 1.0

**Applies to**: ASIO

```
Boost Software License - Version 1.0 - August 17th, 2003

Permission is hereby granted, free of charge, to any person or organization
obtaining a copy of the software and accompanying documentation covered by
this license (the "Software") to use, reproduce, display, distribute,
execute, and transmit the Software, and to prepare derivative works of the
Software, and to permit third-parties to whom the Software is furnished to
do so, all subject to the following:

The copyright notices in the Software and this entire statement, including
the above license grant, this restriction and the following disclaimer,
must be included in all copies of the Software, in whole or in part, and
all derivative works of the Software, unless such copies or derivative
works are solely in the form of machine-executable object code generated by
a source language processor.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
```

- ASIO: Copyright (c) 2003-2024 Christopher M. Kohlhoff

### Apache License 2.0

**Applies to**: OpenSSL, gRPC, Google Benchmark, protobuf (partial),
opentelemetry-cpp, mongo-cxx-driver

A copy of the Apache License 2.0 is available at:
https://www.apache.org/licenses/LICENSE-2.0

Key obligations:
- Include a copy of the license
- State changes made to the software
- Include NOTICE file if present (see `NOTICES` file in repository root)
- Patent grant included

Notable copyright holders:
- OpenSSL: Copyright (c) 1998-2024 The OpenSSL Project Authors
- gRPC: Copyright 2015 gRPC authors
- Google Benchmark: Copyright 2015 Google Inc.
- opentelemetry-cpp: Copyright The OpenTelemetry Authors
- mongo-cxx-driver: Copyright 2024 MongoDB, Inc.

### BSD-3-Clause License

**Applies to**: gtest/gmock, protobuf, hiredis, libpqxx

```
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice,
   this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.
3. Neither the name of the copyright holder nor the names of its
   contributors may be used to endorse or promote products derived from
   this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
```

- Google Test: Copyright 2008, Google Inc.
- Protocol Buffers: Copyright 2008 Google Inc.
- Hiredis: Copyright (c) 2009-2011, Salvatore Sanfilippo and Pieter Noordhuis
- libpqxx: Copyright (c) 2000-2024, Jeroen T. Vermeulen

### zlib License

**Applies to**: zlib

```
This software is provided 'as-is', without any express or implied warranty.
In no event will the authors be held liable for any damages arising from the
use of this software.

Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:

1. The origin of this software must not be misrepresented; you must not
   claim that you wrote the original software. If you use this software in
   a product, an acknowledgment in the product documentation would be
   appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
   misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
```

- zlib: Copyright (C) 1995-2024 Jean-loup Gailly and Mark Adler

### PostgreSQL License

**Applies to**: libpq

```
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.
```

- libpq: Copyright (c) 1996-2024, The PostgreSQL Global Development Group

### LGPL-2.1-or-later

**Applies to**: libiconv, libmariadb (MariaDB Connector/C)

The GNU Lesser General Public License v2.1 is available at:
https://www.gnu.org/licenses/old-licenses/lgpl-2.1.html

**IMPORTANT**: LGPL-2.1 components must be dynamically linked to maintain
BSD-3-Clause licensing of kcenon code. Static linking would impose copyleft
obligations.

Compliance measures:
- **libiconv** (thread_system): CMake build-time check verifies dynamic linking
  via `get_target_property(TYPE)`. macOS provides as system framework. Linux
  glibc includes iconv natively. Windows excluded.
- **libmariadb** (database_system): vcpkg default is shared library. Replaces
  GPL-2.0 libmysql (migrated 2026-03).

Notable copyright holders:
- libiconv: Copyright (C) 1999-2003 Free Software Foundation, Inc.
- libmariadb: Copyright (C) 2012-2024 MariaDB Corporation Ab

### Public Domain

**Applies to**: SQLite

SQLite is in the public domain. No license restrictions apply.

- SQLite: authored by D. Richard Hipp

## Transitive Dependencies

The following components are not declared directly in ecosystem `vcpkg.json`
manifests but are pulled in transitively through pinned third-party ports at
the shared vcpkg baseline `c4af3593e1f1aa9e14a560a09e45ea2cb0dfd74d`.

### Via gRPC 1.51.1

| Dependency | Version | License | Used By |
|------------|---------|---------|---------|
| abseil (absl) | 20240116.1 | Apache-2.0 | container_system, logger_system, monitoring_system, network_system |
| c-ares | 1.28.1 | MIT-CMU | container_system, logger_system, monitoring_system, network_system |
| re2 | 2024-04-01 | BSD-3-Clause | container_system, logger_system, monitoring_system, network_system |
| upb | 2022-06-21 | BSD-2-Clause | container_system, logger_system, monitoring_system, network_system |

### Via opentelemetry-cpp 1.14.2

| Dependency | Version | License | Used By |
|------------|---------|---------|---------|
| nlohmann-json | 3.11.3 | MIT | logger_system |
| curl | 8.7.1 | curl AND ISC AND BSD-3-Clause | logger_system (otlp-http feature) |

### Via mongo-cxx-driver 3.10.1

| Dependency | Version | License | Used By |
|------------|---------|---------|---------|
| mongo-c-driver | 1.26.2 | Apache-2.0 | database_system |
| libbson | 1.26.2 | Apache-2.0 | database_system |

All transitive dependencies use licenses compatible with BSD-3-Clause.
For detailed risk classification, see `docs/SOUP-LIST.md`.

## All Dependencies (Summary)

| Dependency | License | Type | BSD-3 Compatible | LGPL Dynamic |
|------------|---------|------|:----------------:|:------------:|
| fmt | MIT | Core | Yes | - |
| ASIO | BSL-1.0 | Core | Yes | - |
| zlib | Zlib | Core | Yes | - |
| OpenSSL | Apache-2.0 | Optional | Yes | - |
| libiconv | LGPL-2.1 | Optional | Yes | Required |
| libmariadb | LGPL-2.1 | Optional | Yes | Required |
| libpq | PostgreSQL | Optional | Yes | - |
| libpqxx | BSD-3-Clause | Optional | Yes | - |
| sqlite3 | Public Domain | Optional | Yes | - |
| mongo-cxx-driver | Apache-2.0 | Optional | Yes | - |
| hiredis | BSD-3-Clause | Optional | Yes | - |
| gRPC | Apache-2.0 | Optional | Yes | - |
| protobuf | BSD-3-Clause | Optional | Yes | - |
| opentelemetry-cpp | Apache-2.0 | Optional | Yes | - |
| spdlog | MIT | Optional | Yes | - |
| gtest/gmock | BSD-3-Clause | Testing | Yes | - |
| benchmark | Apache-2.0 | Testing | Yes | - |
| abseil | Apache-2.0 | Transitive (gRPC) | Yes | - |
| c-ares | MIT-CMU | Transitive (gRPC) | Yes | - |
| re2 | BSD-3-Clause | Transitive (gRPC) | Yes | - |
| upb | BSD-2-Clause | Transitive (gRPC) | Yes | - |
| nlohmann-json | MIT | Transitive (otel) | Yes | - |
| curl | curl/ISC/BSD-3 | Transitive (otel) | Yes | - |
| mongo-c-driver | Apache-2.0 | Transitive (mongocxx) | Yes | - |
| libbson | Apache-2.0 | Transitive (mongocxx) | Yes | - |