ChessExpert.io YOLOv5 board detector 18012023
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Copyright 2023 ChessExpert.io, for their own training contributions and
resulting model rights, to the extent protected and owned by the author.
Upstream YOLOv5: Ultralytics and contributors.
TensorFlow/Keras YOLOv5 implementation authored by zldrobit, as credited in
upstream models/tf.py. Existing upstream and third-party rights are preserved.

On 2026-11-10 the owner declared that the author trained this detector on 2023-01-18
using their own dataset and the YOLOv5 training notebook. This declaration does
not establish the exact upstream revision or pretrained initialization.
Changes attributed to the owner: chessboard-specific model training and the
resulting exported TensorFlow.js graph and weight shards.

The owner's contributions and model rights identified above are released under
the GNU General Public License version 3 only (SPDX: GPL-3.0-only), not under
proprietary terms. This grant applies only to rights the owner can license;
it does not relicense third-party material or replace its applicable terms.
Full license: /licenses/models/yolov5-18012023-LICENSE.txt

GPL version 3 permits commercial use, copying, modification and redistribution.
When conveying covered material, retain notices and the license, preserve
recipients' GPL rights, and provide Corresponding Source as required by GPL.
The work is supplied WITHOUT ANY WARRANTY, including MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE, to the extent permitted by applicable law.
No new license is assigned to other models, libraries or application code.

Historical upstream references (not confirmed Corresponding Source for this
export):
https://github.com/ultralytics/yolov5/tree/v7.0
https://github.com/ultralytics/yolov5/blob/v7.0/LICENSE
https://github.com/ultralytics/yolov5/blob/v7.0/models/tf.py
The v7.0 release contains a full GPL version 3 license and a GPL-3.0 header in
models/tf.py. The exact revision used for the 18012023 export is not identified.
A later notebook run reports April 15, 2023 revision 94714fe with AGPL and
TensorFlow.js 4.4; that output is not proof of this older artifact's provenance
and does not authorize relicensing AGPL material under GPL.

Maintained editable inference source (full graph, all named tensors and
rebuild/edit/package tools), under GPL-3.0-only for rights held by the owner:
/licenses/models/yolov5-18012023-source.tar.gz
Reorganization and tools: Copyright2026 ChessExpert.io.
This source-only exporter rebuilds all three original files byte-for-byte.
All four raw TFJS outputs match on five local fixtures; separate temporary NMS
threshold and learned-head-bias edits demonstrate changed inference behavior.
The package is the preferred form now maintained for modifying this frozen
inference program, not a recovered original training tree or checkpoint.

Artifact metadata, source archive checksums and historical limits:
/licenses/models/yolov5-18012023-provenance.json
Historical v7.0 remains a reference only. Source availability/modifiability does
not certify all historical provenance, third-party rights or app integration.