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Third-Party Notices: Spelling Practice

This file must stay in the app's source repository and be shown, in full, from the app's About page ("View full license"). It lists every outside source used to build the Spelling Practice pattern lists and pattern lookup, and the font the app ships.

1. CMU Pronouncing Dictionary: SHIPPED (derived data), CREDIT REQUIRED

What it is: a pronouncing dictionary of North American English created by the Speech Group at Carnegie Mellon University.

How it is used: every pattern word list, and 03_Data/pattern_lookup.json, was built by testing each word's spelling against its pronunciation in this dictionary. Both files ship with the app, so the notice below must be reproduced with the app.

Required credit (About page): "Spelling pattern lists and pattern checks use the CMU Pronouncing Dictionary. Copyright (C) 1993-2015 Carnegie Mellon University. All rights reserved. Used under the CMU Pronouncing Dictionary license."

Required credit (worksheet footer, pattern-based lists): "Word list uses the CMU Pronouncing Dictionary (Carnegie Mellon University)."

Full license text (reproduce exactly):

Copyright (C) 1993-2015 Carnegie Mellon University. All rights reserved.

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.
   The contents of this file are deemed to be source code.

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.

This work was supported in part by funding from the Defense Advanced
Research Projects Agency, the Office of Naval Research and the National
Science Foundation of the United States of America, and by member
companies of the Carnegie Mellon Sphinx Speech Consortium. We acknowledge
the contributions of many volunteers to the expansion and improvement of
this dictionary.

THIS SOFTWARE IS PROVIDED BY CARNEGIE MELLON UNIVERSITY ``AS IS'' AND
ANY EXPRESSED 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 CARNEGIE MELLON UNIVERSITY
NOR ITS EMPLOYEES 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.

2. WordNet 3.0: build time only, not shipped

How it is used: to keep common English words and drop proper nouns while building the lists. No WordNet data ships with the app.

WordNet Release 3.0

This software and database is being provided to you, the LICENSEE, by
Princeton University under the following license.  By obtaining, using
and/or copying this software and database, you agree that you have
read, understood, and will comply with these terms and conditions.:

Permission to use, copy, modify and distribute this software and
database and its documentation for any purpose and without fee or
royalty is hereby granted, provided that you agree to comply with
the following copyright notice and statements, including the disclaimer,
and that the same appear on ALL copies of the software, database and
documentation, including modifications that you make for internal
use or for distribution.

WordNet 3.0 Copyright 2006 by Princeton University.  All rights reserved.

THIS SOFTWARE AND DATABASE IS PROVIDED "AS IS" AND PRINCETON
UNIVERSITY MAKES NO REPRESENTATIONS OR WARRANTIES, EXPRESS OR
IMPLIED.  BY WAY OF EXAMPLE, BUT NOT LIMITATION, PRINCETON
UNIVERSITY MAKES NO REPRESENTATIONS OR WARRANTIES OF MERCHANT-
ABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE OR THAT THE USE
OF THE LICENSED SOFTWARE, DATABASE OR DOCUMENTATION WILL NOT
INFRINGE ANY THIRD PARTY PATENTS, COPYRIGHTS, TRADEMARKS OR
OTHER RIGHTS.

The name of Princeton University or Princeton may not be used in
advertising or publicity pertaining to distribution of the software
and/or database.  Title to copyright in this software, database and
any associated documentation shall at all times remain with
Princeton University and LICENSEE agrees to preserve same.

3. NLTK Names Corpus: build time only, not shipped

How it is used: to drop people's names from the lists. No names data ships with the app. Credit is given here as the corpus requests.

Names Corpus, Version 1.3 (1994-03-29)
Copyright (C) 1991 Mark Kantrowitz
Additions by Bill Ross

This corpus contains 5001 female names and 2943 male names, sorted
alphabetically, one per line.

You may use the lists of names for any purpose, so long as credit is
given in any published work. You may also redistribute the list if you
provide the recipients with a copy of this README file. The lists are
not in the public domain (I retain the copyright on the lists) but are
freely redistributable.  If you have any additions to the lists of
names, I would appreciate receiving them.

Mark Kantrowitz <mkant+@cs.cmu.edu>
http://www-2.cs.cmu.edu/afs/cs/project/ai-repository/ai/areas/nlp/corpora/names/

4. wordfreq: build time only, not shipped

How it is used: to rank candidate words by how common they are in English. Only the order of the words was used; no frequency numbers are exported or shipped.

  • wordfreq by Robyn Speer. Code licensed Apache-2.0. The word-frequency data carries its own license (see the wordfreq project README).

5. Python tools: build time only, not shipped

  • cmudict Python package: a wrapper that loads the CMU dictionary files for the build script. The wrapper is GPL-licensed; it is used only to run the script and is not part of the app. The dictionary data it loads is covered by the CMU license above.
  • NLTK (Natural Language Toolkit): Apache-2.0. Used to load WordNet and the names corpus.

6. Andika font: SHIPPED (font file, and embedded in printed worksheets)

  • Andika, version 6.101, by SIL International. Used unmodified, for printed words and for the grade 1 and 2 worksheets, because its single-storey a and g match how children are taught to write.
  • The font file ships with the app (public/fonts/Andika-Regular.ttf) and is embedded in the worksheet PDFs the app makes. Embedding is permitted by the license. Worksheets made with the font are not covered by the license.
  • Copyright, as recorded in the font file: Copyright (c) 2004-2022 SIL International.
  • License: SIL Open Font License, Version 1.1, reproduced below as the license requires.
SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007

PREAMBLE
The goals of the Open Font License (OFL) are to stimulate worldwide
development of collaborative font projects, to support the font creation
efforts of academic and linguistic communities, and to provide a free and
open framework in which fonts may be shared and improved in partnership
with others.

The OFL allows the licensed fonts to be used, studied, modified and
redistributed freely as long as they are not sold by themselves. The
fonts, including any derivative works, can be bundled, embedded,
redistributed and/or sold with any software provided that any reserved
names are not used by derivative works. The fonts and derivatives,
however, cannot be released under any other type of license. The
requirement for fonts to remain under this license does not apply
to any document created using the fonts or their derivatives.

DEFINITIONS
"Font Software" refers to the set of files released by the Copyright
Holder(s) under this license and clearly marked as such. This may
include source files, build scripts and documentation.

"Reserved Font Name" refers to any names specified as such after the
copyright statement(s).

"Original Version" refers to the collection of Font Software components as
distributed by the Copyright Holder(s).

"Modified Version" refers to any derivative made by adding to, deleting,
or substituting -- in part or in whole -- any of the components of the
Original Version, by changing formats or by porting the Font Software to a
new environment.

"Author" refers to any designer, engineer, programmer, technical
writer or other person who contributed to the Font Software.

PERMISSION & CONDITIONS
Permission is hereby granted, free of charge, to any person obtaining
a copy of the Font Software, to use, study, copy, merge, embed, modify,
redistribute, and sell modified and unmodified copies of the Font
Software, subject to the following conditions:

1) Neither the Font Software nor any of its individual components,
in Original or Modified Versions, may be sold by itself.

2) Original or Modified Versions of the Font Software may be bundled,
redistributed and/or sold with any software, provided that each copy
contains the above copyright notice and this license. These can be
included either as stand-alone text files, human-readable headers or
in the appropriate machine-readable metadata fields within text or
binary files as long as those fields can be easily viewed by the user.

3) No Modified Version of the Font Software may use the Reserved Font
Name(s) unless explicit written permission is granted by the corresponding
Copyright Holder. This restriction only applies to the primary font name as
presented to the users.

4) The name(s) of the Copyright Holder(s) and the Author(s) of the Font
Software shall not be used to promote, endorse or advertise any
Modified Version, except to acknowledge the contribution(s) of the
Copyright Holder(s) and the Author(s) or with their explicit written
permission.

5) The Font Software, modified or unmodified, in part or in whole,
must be distributed entirely under this license, and must not be
distributed under any other license. The requirement for fonts to
remain under this license does not apply to any document created
using the Font Software.

TERMINATION
This license becomes null and void if any of the above conditions are
not met.

DISCLAIMER
THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE
COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM
OTHER DEALINGS IN THE FONT SOFTWARE.

7. Kokoro voice model: build time only, not shipped. Its recordings are SHIPPED

The recorded voice in this app was made ahead of time with the Kokoro-82M voice model, using its "af_bella" voice. It is a computer-generated voice, not a person reading.

  • Model: https://huggingface.co/hexgrad/Kokoro-82M (revision f3ff3571791e39611d31c381e3a41a3af07b4987)
  • License: Apache License 2.0

The model itself is not part of this app; only the recordings are. Making them also used misaki, spaCy, eSpeak NG, PyTorch and FFmpeg, which ran on the developer's computer and are not shipped.