SLOW DOWN BUDDY — THIRD-PARTY NOTICES https://slowdownbuddy.com/licenses/ Last updated October 30, 2026 Slow Down Buddy's own code is (c) Michael Van Bebber. The web app also contains the open-source software listed below. Full license texts are included in this file or alongside it in https://slowdownbuddy.com/licenses/ . Summary 1. Signalsmith Stretch 1.3.2 ............ MIT ............... inlined in index.html (time-stretch / pitch-shift) 2. Emscripten runtime (generated code) ... MIT ............... inlined in index.html and the decoder files 3. @wasm-audio-decoders/flac 0.2.11 ..... MIT ............... flac-decoder.min.js 4. libFLAC (compiled to WebAssembly) .. BSD-3-Clause ...... flac-decoder.min.js 5. codec-parser 2.5.0 ................. LGPL-3.0-or-later . flac-decoder.min.js (see section 5) 6. opus-decoder 0.7.12 .................. MIT ............... opus-decoder.min.js 7. libopus (compiled to WebAssembly) .. BSD-3-Clause ...... opus-decoder.min.js 8. @wasm-audio-decoders/common 9.0.7 .... MIT ............... flac-decoder.min.js, opus-decoder.min.js 9. puff 2.3 (inflate, WebAssembly) .... zlib-style ........ flac-decoder.min.js, opus-decoder.min.js 10. simple-yenc ........................ MIT ............... flac-decoder.min.js, opus-decoder.min.js 11. Apple Lossless (ALAC) decoder port ... Apache-2.0 ........ m4a-decoder.js 12. GoatCounter count.js ................. ISC ............... vendor/goatcounter-count.js 13. Demo recording (demo.mp3) ............ CC0 1.0 (public domain dedication) The minified decoder files are byte-for-byte the "dist" builds published on npm (opus-decoder.min.js with its source-map comment removed). Their unmodified source packages are available at https://slowdownbuddy.com/licenses/source/ (SHA-256 checksums in SHA256SUMS.txt). ==================================================================================================== 1. Signalsmith Stretch 1.3.2 (JS/WASM release) https://signalsmith-audio.co.uk/code/stretch/ Copyright (c) Geraint Luff / Signalsmith Audio Ltd. Modification: the worklet code adds an attack-preserving time map (setWarp / warpAt), marked in the source. 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. ==================================================================================================== 2. Emscripten runtime Portions of the JavaScript glue around the WebAssembly modules are generated by Emscripten. Copyright (c) 2010-2014 Emscripten authors, see AUTHORS file (https://github.com/emscripten-core/emscripten). 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. ==================================================================================================== 3. @wasm-audio-decoders/flac 0.2.11, 6. opus-decoder 0.7.12, 8. @wasm-audio-decoders/common 9.0.7, 10. simple-yenc https://github.com/eshaz/wasm-audio-decoders , https://github.com/eshaz/simple-yenc Copyright 2021-2026 Ethan Halsall 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. ==================================================================================================== 4. libFLAC (Free Lossless Audio Codec library), compiled to WebAssembly inside flac-decoder.min.js https://github.com/xiph/flac Copyright (C) 2000-2009 Josh Coalson Copyright (C) 2011-2025 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. ==================================================================================================== 5. codec-parser 2.5.0, bundled inside flac-decoder.min.js https://github.com/eshaz/codec-parser Copyright Ethan Halsall License: GNU Lesser General Public License, version 3 or (at your option) any later version. codec-parser is used, unmodified, as part of flac-decoder.min.js, which Slow Down Buddy loads as a separate file only when it needs to decode FLAC audio itself. You may replace that file with a version built from modified source. The corresponding source code is provided at: https://slowdownbuddy.com/licenses/source/codec-parser-2.5.0.tgz https://slowdownbuddy.com/licenses/source/wasm-audio-decoders-flac-0.2.11.tgz https://slowdownbuddy.com/licenses/source/wasm-audio-decoders-common-9.0.7.tgz The LGPL-3.0 text is in LICENSE-LGPL-3.0.txt and the GPL-3.0 text it builds on is in LICENSE-GPL-3.0.txt, both at https://slowdownbuddy.com/licenses/ . ==================================================================================================== 7. libopus (Opus audio codec), compiled to WebAssembly inside opus-decoder.min.js https://github.com/xiph/opus Copyright 2001-2023 Xiph.Org, Skype Limited, Octasic, Jean-Marc Valin, Timothy B. Terriberry, CSIRO, Gregory Maxwell, Mark Borgerding, Erik de Castro Lopo, Mozilla, Amazon 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 Internet Society, IETF or IETF Trust, nor the names of specific 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 OWNER 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. Opus is subject to the royalty-free patent licenses which are specified at: Xiph.Org Foundation: https://datatracker.ietf.org/ipr/1524/ Microsoft Corporation: https://datatracker.ietf.org/ipr/1914/ Broadcom Corporation: https://datatracker.ietf.org/ipr/1526/ ==================================================================================================== 9. puff 2.3 (a small deflate decoder used to unpack the WebAssembly), compiled into the decoder files From the zlib distribution (contrib/puff). Copyright (C) 2002-2013 Mark Adler, all rights reserved version 2.3, 21 Jan 2013 This software is provided 'as-is', without any express or implied warranty. In no event will the author 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. Mark Adler madler@alumni.caltech.edu ==================================================================================================== 11. Apple Lossless (ALAC) decoder, ported to JavaScript in m4a-decoder.js Derived from Apple's ALAC reference decoder, https://github.com/macosforge/alac Copyright (c) 2011 Apple Inc. All rights reserved. With reference to alac.js by Jens Nockert and Devon Govett (OFMLabs), https://github.com/audiocogs/alac.js Licensed under the Apache License, Version 2.0. The full license text is in LICENSE-Apache-2.0.txt at https://slowdownbuddy.com/licenses/ . (Apple's ALAC repository contains no NOTICE file.) Changes: rewritten in plain JavaScript (no C++), with an MP4 container reader added, support for 20/24/32-bit samples, and planar floating-point output for Web Audio. m4a-decoder.js is the source form. Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. 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. ==================================================================================================== 12. GoatCounter count.js (analytics client), self-hosted as vendor/goatcounter-count.js https://github.com/arp242/goatcounter (public/count.js at commit c031008a8d28c85b36708824f23b28957e7ed262) Copyright (c) Martin Tournoij. The file states: "This file is released under the ISC license." ISC License Copyright (c) Martin Tournoij Permission to use, copy, modify, and/or distribute this software for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies. THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. ==================================================================================================== 13. Demo recording (demo.mp3) J. S. Bach, Prelude No. 1 in C major, BWV 846, performed by Kimiko Ishizaka, from "The Open Well-Tempered Clavier" (2015), https://welltemperedclavier.org/ Released into the public domain under Creative Commons CC0 1.0 Universal. The audio stream is unchanged; embedded cover art and metadata were removed.