ChessExpert.io copied assets and fonts
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Chess pieces (chessboard-sprite.svg and chessboard-sprite-chessexpert.svg)
Authors: Cburnett and Rfc1394; adapted by Stefan Haack (shaack) for cm-chessboard.
Source: https://commons.wikimedia.org/wiki/Category:SVG_chess_pieces/Standard
https://github.com/shaack/cm-chessboard
License: Creative Commons Attribution-ShareAlike 3.0 Unported.
Full text: /licenses/CC-by-sa-3.0.txt
https://creativecommons.org/licenses/by-sa/3.0/
The original attribution and modification notices remain in each SVG file.
Commercial use is allowed. Adaptations of these graphics must be distributed
under the applicable ShareAlike terms; this does not license all app code.

Font Awesome Free SVG icons
Copyright 2026 Fonticons, Inc. https://fontawesome.com
Icons: Creative Commons Attribution 4.0 International.
Full text: /licenses/CC-by-4.0.txt
https://creativecommons.org/licenses/by/4.0/
Code: MIT (full notices in THIRD-PARTY-NOTICES.txt).
https://fontawesome.com/license/free

IBM Plex Sans
Copyright 2017 IBM Corp. Reserved Font Name: Plex.
SIL Open Font License 1.1: /licenses/fonts/ibmplexsans-OFL.txt
https://github.com/google/fonts/tree/0b58fb370093f9a9f4ff785d94405710b79de67c/ofl/ibmplexsans

Cormorant Garamond
Copyright 2015 the Cormorant Project Authors.
SIL Open Font License 1.1: /licenses/fonts/cormorantgaramond-OFL.txt
https://github.com/CatharsisFonts/Cormorant
Pinned complete variable-font sources and distributed WOFF2 checksums:
/licenses/fonts/provenance.json

Chess opening names and move data
Source: lichess-org/chess-openings, commit c67912be581f0793dbaa776be5ccf111e01f88d9
https://github.com/lichess-org/chess-openings/tree/c67912be581f0793dbaa776be5ccf111e01f88d9
CC0 1.0 Universal: https://creativecommons.org/publicdomain/zero/1.0/

Hough Transform public example
Copyright 2012 Guillaume Marty; adaptations by Hannah Dee (2014, 2016).
Apache License 2.0. Original copyright, license and changes retained in
/hough/houghTransform.js and /hough/index.html.

Legacy public PDF.js script (/js/pdf.worker.min.js)
Copyright 2023 Mozilla Foundation. Apache License 2.0.
Original copyright and license notice retained in the script.
The active reader uses pdfjs-dist instead, included in dependency notices.

Apache License 2.0 full text: /licenses/Apache-2.0.txt

ChessExpert.io piece-classification CNN 08082025
Copyright 2026 ChessExpert.io, subject to applicable law and third-party rights.
The owner states that they trained this CNN on their own private dataset. This
is an owner declaration, not an independently reconstructed training history.
The graph and weights remain proprietary; use through authorized ChessExpert.io
applications, including necessary download/cache/inference, is permitted.
Separate reuse, modification/fine-tuning or redistribution requires permission
except where applicable law permits it. Other models and libraries are unaffected.
Model-specific notice: /licenses/models/08082025-LICENSE.txt
Exact runtime file identities and declaration: /licenses/models/provenance.json

SSDLite board detector 3501 uint8
The owner confirms the Roboflow v3 training dataset is their own dataset.
ChessExpert.io retains proprietary rights only in their own training contributions
and resulting model rights; this is not exclusive ownership of pretrained/base
weights or architecture. Normal ChessExpert.io loading/cache/inference is permitted.
Applicable upstream/third-party licenses and mandatory rights remain unaffected.
The TensorFlow publisher lists the plain SSD MobileNetV2 TensorFlow2 v1 base under
Apache 2.0; matching SavedModel variable payload/index bytes link that publisher
model to SavedModel variable files inside the original Google checkpoint archive.
Whole archives/graphs and checkpoint/ckpt-0 files are not claimed to be identical.
Owner-contribution terms: /licenses/models/ssdlite-board-3501-uint8-LICENSE.txt
Upstream copyright/license and changes: /licenses/models/ssdlite-UPSTREAM-NOTICES.txt
Full preserved upstream license: /licenses/models/ssdlite-UPSTREAM-LICENSE.txt
Evidence: /licenses/models/ssdlite-upstream-evidence.json
Runtime identities and owner declaration: /licenses/models/provenance.json

YOLOv5 board detector 18012023
Copyright 2023 ChessExpert.io for the author’s own contributions/model rights.
Upstream: Ultralytics and contributors; TensorFlow implementation by zldrobit.
Owner contributions: GPL-3.0-only; upstream/third-party rights preserved.
Commercial use is permitted under GPL; recipients retain GPL rights and
Corresponding Source requirements apply to covered distributions.
Full license: /licenses/models/yolov5-18012023-LICENSE.txt
Attribution and limits: /licenses/models/yolov5-18012023-NOTICES.txt
Declaration, file identities and source status:
/licenses/models/yolov5-18012023-provenance.json
Historical upstream reference (not confirmed exact source for this export):
https://github.com/ultralytics/yolov5/tree/v7.0

YOLOv5 maintained inference source (2026-11-10):
/licenses/models/yolov5-18012023-source.tar.gz
Full editable graph, all named tensors and rebuild/edit/package tools under
GPL-3.0-only for rights held. Copyright2026 ChessExpert.io for representation
and tools. Exact three-file rebuild and real TFJS modification verified.
Reconstructed maintained inference source, not recovered training history.