KUON R&D · LEGAL

OSS ライセンス

Kuon R&D (空音開発) が提供する各アプリで使用しているオープンソースソフトウェアの著作権表示およびライセンス全文. 法的義務の充足のために掲載しています.

Last updated: 2026-05-12

KUON ENCODER (/encoder-lp)

LAME (LGPL v2.1)

Licensed under the GNU Lesser General Public License v2.1. License text

FLAC (BSD-3-Clause / Xiph.Org Foundation)

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

- Redistributions of source code must retain the above copyright notice, this
  list of conditions and the following disclaimer.
- 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.
- Neither the name of the Xiph.org Foundation 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 FOUNDATION 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.

KUON RESTORE (/restore-lp)

KUON RESTORE の Cubic Hermite Spline 補間 (General Declip / Piano Declip / Amp Restore) はすべて空音開発の自社実装で、外部 OSS ライブラリには依存していません.

KUON CLEAN (/clean-lp)

Phase 1: 自社実装

Spectral Gate (STFT Spectral Subtraction) および Hum Remover (IIR Biquad Notch) はすべて空音開発の自社実装で、外部 OSS ライブラリには依存していません.

AI Speech Enhance — RNNoise (3 components, 稼働中)

KUON CLEAN の AI Speech Enhance モードは Phase 2 (2026-05-12) で稼働開始しました. 配布物は 3 つのコンポーネントで構成され、それぞれ異なるライセンスを持ちます:

RNNoise C library (BSD-3-Clause) — © Jean-Marc Valin, Mozilla, Xiph.Org, Amazon, Mark Borgerding
rnnoise.wasm — 110 KB WebAssembly binary compiled from the above C library via emscripten
rnnoise.js — 12 KB emscripten-generated JavaScript loader (Apache License 2.0) — © Jitsi

The Wasm binary and the JavaScript loader together are distributed under Apache License 2.0 by Jitsi (`jitsi/rnnoise-wasm`). The underlying C library retains its BSD-3-Clause license. Both license texts follow.

① Wasm wrapper + JS loader: Apache License 2.0 (Jitsi)

jitsi/rnnoise-wasm (含む rnnoise.wasm および emscripten 生成の rnnoise.js). © Jitsi. https://github.com/jitsi/rnnoise-wasm

                                 Apache License
                           Version 2.0, January 2004
                        http://www.apache.org/licenses/

(Full text available at https://www.apache.org/licenses/LICENSE-2.0)

Licensed under the Apache License, Version 2.0 (the "License"); you may not
use this file except in compliance with the License. You may obtain a copy of
the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
License for the specific language governing permissions and limitations under
the License.

② C library 本家: BSD-3-Clause (Xiph.Org Foundation)

xiph/rnnoise. https://github.com/xiph/rnnoise

Copyright (c) 2007-2017, 2024 Jean-Marc Valin
Copyright (c) 2023 Amazon
Copyright (c) 2017, Mozilla
Copyright (c) 2005-2017, Xiph.Org Foundation
Copyright (c) 2003-2004, Mark Borgerding

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

- Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.

- 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.

- Neither the name of the Xiph.Org Foundation 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 FOUNDATION
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.

その他

fflate (MIT)

Bravura (SIL OFL 1.1)

Bravura music font. © Steinberg Media Technologies GmbH. SIL Open Font License 1.1. https://github.com/steinbergmedia/bravura

Salamander Grand Piano (CC BY 3.0)

Built-in grand piano samples: Salamander Grand Piano by Alexander Holm, licensed under Creative Commons Attribution 3.0. https://freepats.zenvoid.org/Piano/acoustic-grand-piano.html

Upright Piano KW (CC0 1.0)

Built-in upright piano samples: Upright Piano KW by the FreePats project, dedicated to the public domain under CC0 1.0.