Ottershelf includes or is built with the software below. Each keeps its own licence; the full texts of the licences for code bundled in the app’s assets and native libraries follow.
| Component | Where | Licence |
|---|---|---|
| foliate-js (John Factotum), from BookOrbit’s copy, modified | app/src/main/assets/foliate/ |
MIT |
| zip.js (Gildas Lormeau) | app/src/main/assets/foliate/vendor/zip.js |
BSD-3-Clause |
| fflate (Arjun Barrett) | app/src/main/assets/foliate/vendor/fflate.js |
MIT |
| Lucide icons (and the Feather icons they derive from) | app/src/main/assets/lucide.txt, ui/icons/LucideBuiltIn.kt |
ISC (Feather: MIT) |
| Jetpack Compose, AndroidX, CameraX, WorkManager, DataStore | Gradle dependency | Apache-2.0 |
| Kotlin, kotlinx.coroutines, kotlinx.serialization | Gradle dependency | Apache-2.0 |
| OkHttp, Okio | Gradle dependency | Apache-2.0 |
| Coil | Gradle dependency | Apache-2.0 |
| Telephoto | Gradle dependency | Apache-2.0 |
| zxing-cpp 3.1.1 (Axel Waggershauser, Nu-book Inc., ZXing authors): the ISBN barcode reader | Gradle dependency (io.github.zxing-cpp:android, Maven Central), native libzxingcpp_android.so |
Apache-2.0 |
| Tesseract OCR 5.5.1 (Google Inc., the Tesseract contributors): the quotes’ page reading | through Tesseract4Android, native libtesseract.so |
Apache-2.0 |
| Tesseract4Android 4.9.0 (Adaptech s.r.o., Robert Pösel; from tess-two, Robert Theis and Google Inc.) | Gradle dependency (cz.adaptech.tesseract4android:tesseract4android, JitPack) |
Apache-2.0 |
Tesseract’s English model, eng.traineddata from tessdata_fast |
app/src/main/assets/tessdata/eng.traineddata (see below) |
Apache-2.0 |
| Leptonica 1.85.0 (Dan Bloomberg, Leptonica) | bundled with Tesseract4Android, native libleptonica.so |
BSD-2-Clause style (below) |
| libpng 1.6.48 (the PNG Reference Library Authors) | bundled with Tesseract4Android, native libpngx.so |
PNG Reference Library License version 2 (below) |
| libjpeg 9f (the Independent JPEG Group) | bundled with Tesseract4Android, native libjpeg.so |
IJG licence (below) |
BookOrbit itself: see NOTICE, ADDITIONAL_TERMS.md and LICENSE.
Test fixtures from Wikimedia. Some files in app/src/test/resources/lookup/ (def_*.json,
sum_serendipity.json, sum_de_haus.json, sum_mercury.json) are responses recorded from the
Wiktionary and Wikipedia REST APIs, used only by the unit tests; they are not part of the app.
Their text is from Wiktionary and Wikipedia contributors, licensed under the Creative Commons
Attribution-ShareAlike 4.0 licence (https://creativecommons.org/licenses/by-sa/4.0/); the source
of each is the entry it is named after, on en.wiktionary.org, fr.wiktionary.org, de.wikipedia.org
or en.wikipedia.org. The other files there were written for the tests.
MIT License
Copyright (c) 2022 John Factotum
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.
BSD 3-Clause License
Copyright (c) 2023, Gildas Lormeau
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.
MIT License
Copyright (c) 2026 Arjun Barrett
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.```
## lucide-icons/lucide
ISC License
Copyright (c) 2026 Lucide Icons and Contributors
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.
The following Lucide icons are derived from the Feather project:
airplay, alert-circle, alert-octagon, alert-triangle, aperture, arrow-down-circle, arrow-down-left, arrow-down-right, arrow-down, arrow-left-circle, arrow-left, arrow-right-circle, arrow-right, arrow-up-circle, arrow-up-left, arrow-up-right, arrow-up, at-sign, calendar, cast, check, chevron-down, chevron-left, chevron-right, chevron-up, chevrons-down, chevrons-left, chevrons-right, chevrons-up, circle, clipboard, clock, code, columns, command, compass, corner-down-left, corner-down-right, corner-left-down, corner-left-up, corner-right-down, corner-right-up, corner-up-left, corner-up-right, crosshair, database, divide-circle, divide-square, dollar-sign, download, external-link, feather, frown, hash, headphones, help-circle, info, italic, key, layout, life-buoy, link-2, link, loader, lock, log-in, log-out, maximize, meh, minimize, minimize-2, minus-circle, minus-square, minus, monitor, moon, more-horizontal, more-vertical, move, music, navigation-2, navigation, octagon, pause-circle, percent, plus-circle, plus-square, plus, power, radio, rss, search, server, share, shopping-bag, sidebar, smartphone, smile, square, table-2, tablet, target, terminal, trash-2, trash, triangle, tv, type, upload, x-circle, x-octagon, x-square, x, zoom-in, zoom-out
The MIT License (MIT) (for the icons listed above)
Copyright (c) 2013-present Cole Bemis
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.
## Tesseract's English model (tesseract-ocr/tessdata_fast)
`app/src/main/assets/tessdata/eng.traineddata` is the English model of the tessdata_fast
repository (the fast integer LSTM models, for Tesseract 4 and 5), unmodified:
- Source: https://github.com/tesseract-ocr/tessdata_fast/blob/87416418657359cb625c412a48b6e1d6d41c29bd/eng.traineddata
(downloaded from `https://github.com/tesseract-ocr/tessdata_fast/raw/87416418657359cb625c412a48b6e1d6d41c29bd/eng.traineddata`)
- Repository commit: 87416418657359cb625c412a48b6e1d6d41c29bd (the file itself last changed in
923915d4ced2a7235221788285785a29c4a42d4a)
- Size 4,113,088 bytes; git blob bbef4675053b5b468cdb477053e28b1c698ba08e; SHA-256
7d4322bd2a7749724879683fc3912cb542f19906c83bcc1a52132556427170b2
- Licence: Apache-2.0 (the repository's `LICENSE`, the text below)
## Apache License 2.0: zxing-cpp, Tesseract OCR, Tesseract4Android and tessdata_fast
- zxing-cpp (https://github.com/zxing-cpp/zxing-cpp): Copyright 2016 Nu-book Inc., Copyright 2016
ZXing authors, Copyright Axel Waggershauser and the zxing-cpp contributors.
- Tesseract OCR (https://github.com/tesseract-ocr/tesseract): Copyright Hewlett-Packard, Google Inc.
and the Tesseract contributors (its `AUTHORS` file).
- Tesseract4Android (https://github.com/adaptech-cz/Tesseract4Android): Copyright (C) 2019 Adaptech
s.r.o., Robert Pösel; Copyright (C) 2011 Google Inc.; Copyright (C) 2011 Robert Theis.
- tessdata_fast (https://github.com/tesseract-ocr/tessdata_fast): the Tesseract authors.
Each is licensed under the Apache License, Version 2.0:
Apache License
Version 2.0, January 2004
http://www.apache.org/licenses/
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## Leptonica
/====================================================================
## libpng
COPYRIGHT NOTICE, DISCLAIMER, and LICENSE =========================================
The software is supplied “as is”, without warranty of any kind, express or implied, including, without limitation, the warranties of merchantability, fitness for a particular purpose, title, and non-infringement. In no event shall the Copyright owners, 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, even if advised of the possibility of such damage.
Permission is hereby granted to use, copy, modify, and distribute this software, or portions hereof, for any purpose, without fee, subject to the following restrictions:
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.
Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
This Copyright notice may not be removed or altered from any source or altered source distribution.
libpng versions 1.0.7, July 1, 2000, through 1.6.35, July 15, 2018 are Copyright (c) 2000-2002, 2004, 2006-2018 Glenn Randers-Pehrson, are derived from libpng-1.0.6, and are distributed according to the same disclaimer and license as libpng-1.0.6 with the following individuals added to the list of Contributing Authors:
Simon-Pierre Cadieux
Eric S. Raymond
Mans Rullgard
Cosmin Truta
Gilles Vollant
James Yu
Mandar Sahastrabuddhe
Google Inc.
Vadim Barkov
and with the following additions to the disclaimer:
There is no warranty against interference with your enjoyment of
the library or against infringement. There is no warranty that our
efforts or the library will fulfill any of your particular purposes
or needs. This library is provided with all faults, and the entire
risk of satisfactory quality, performance, accuracy, and effort is
with the user.
Some files in the “contrib” directory and some configure-generated files that are distributed with libpng have other copyright owners, and are released under other open source licenses.
libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are Copyright (c) 1998-2000 Glenn Randers-Pehrson, are derived from libpng-0.96, and are distributed according to the same disclaimer and license as libpng-0.96, with the following individuals added to the list of Contributing Authors:
Tom Lane
Glenn Randers-Pehrson
Willem van Schaik
libpng versions 0.89, June 1996, through 0.96, May 1997, are Copyright (c) 1996-1997 Andreas Dilger, are derived from libpng-0.88, and are distributed according to the same disclaimer and license as libpng-0.88, with the following individuals added to the list of Contributing Authors:
John Bowler
Kevin Bracey
Sam Bushell
Magnus Holmgren
Greg Roelofs
Tom Tanner
Some files in the “scripts” directory have other copyright owners, but are released under this license.
libpng versions 0.5, May 1995, through 0.88, January 1996, are Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
For the purposes of this copyright and license, “Contributing Authors” is defined as the following set of individuals:
Andreas Dilger
Dave Martindale
Guy Eric Schalnat
Paul Schmidt
Tim Wegner
The PNG Reference Library is supplied “AS IS”. The Contributing Authors and Group 42, Inc. disclaim all warranties, expressed or implied, including, without limitation, the warranties of merchantability and of fitness for any purpose. The Contributing Authors and Group 42, Inc. assume no liability for direct, indirect, incidental, special, exemplary, or consequential damages, which may result from the use of the PNG Reference Library, even if advised of the possibility of such damage.
Permission is hereby granted to use, copy, modify, and distribute this source code, or portions hereof, for any purpose, without fee, subject to the following restrictions:
The origin of this source code must not be misrepresented.
Altered versions must be plainly marked as such and must not be misrepresented as being the original source.
This Copyright notice may not be removed or altered from any source or altered source distribution.
The Contributing Authors and Group 42, Inc. specifically permit, without fee, and encourage the use of this source code as a component to supporting the PNG file format in commercial products. If you use this source code in a product, acknowledgment is not required but would be appreciated.
## libjpeg (the Independent JPEG Group's software)
This software is based in part on the work of the Independent JPEG Group.
From libjpeg 9f's README:
LEGAL ISSUES ============
In plain English:
In legalese:
The authors make NO WARRANTY or representation, either express or implied, with respect to this software, its quality, accuracy, merchantability, or fitness for a particular purpose. This software is provided “AS IS”, and you, its user, assume the entire risk as to its quality and accuracy.
This software is copyright (C) 1991-2024, Thomas G. Lane, Guido Vollbeding. All Rights Reserved except as specified below.
Permission is hereby granted to use, copy, modify, and distribute this software (or portions thereof) for any purpose, without fee, subject to these conditions: (1) If any part of the source code for this software is distributed, then this README file must be included, with this copyright and no-warranty notice unaltered; and any additions, deletions, or changes to the original files must be clearly indicated in accompanying documentation. (2) If only executable code is distributed, then the accompanying documentation must state that “this software is based in part on the work of the Independent JPEG Group”. (3) Permission for use of this software is granted only if the user accepts full responsibility for any undesirable consequences; the authors accept NO LIABILITY for damages of any kind.
These conditions apply to any software derived from or based on the IJG code, not just to the unmodified library. If you use our work, you ought to acknowledge us.
Permission is NOT granted for the use of any IJG author’s name or company name in advertising or publicity relating to this software or products derived from it. This software may be referred to only as “the Independent JPEG Group’s software”.
We specifically permit and encourage the use of this software as the basis of commercial products, provided that all warranty or liability claims are assumed by the product vendor. ```