C7: per-plugin licence file

LICENSE

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+# Licence of the CaptchaOCR dataset
+
+**This dataset has no single licence.** Every row of it belongs to a different upstream
+Minecraft anti-bot plugin, and those plugins do not share one licence. The licence of a row is
+the licence of the plugin that row was re-rendered from — check the tables below before you use
+the data.
+
+That is exactly what the YAML header of the dataset card means:
+
+```yaml
+license: other
+license_name: mixed-per-plugin-licences
+```
+
+| | |
+|---|---|
+| repository | `Titlehhhh/captchaocr-dataset` (dataset) |
+| captcha types | **46** |
+| labelled PNG | **4600** (4600 rows in `labels.jsonl`) |
+| upstream plugins | **23** |
+| reconstruction modes | faithful 25 · clean-room 16 · reconstructed 5 |
+
+## What the pictures actually are
+
+**Every PNG in this dataset is our own render.** All 4600 images were produced by this
+project's **own Java generators** — not by a live server, not by a third-party service, and not
+by copying anybody else's pictures. The renders reproduce the upstream algorithms (font,
+palette, noise, layout, even the upstream defect), but the pixels are a re-render, not a
+screenshot of a real session.
+
+The reference screenshots of the upstream plugins are **not** part of this dataset: they are other
+people's images, they stay in the project's working tree and they are not redistributed here.
+
+The `source` field of every row of `labels.jsonl` names the upstream class and method the type
+was re-implemented from, so the provenance of any single row can be audited without trusting
+this file.
+
+## The licences, in one table
+
+| licence | upstream plugins | captcha types | PNG |
+|---|---|---|---|
+| AGPL-3.0 | `LimboFilter` | 4 | 400 |
+| BSD-2-Clause + запрет на коммерческий хостинг | `BotFilter` | 1 | 100 |
+| CC0-1.0 | `jSdCool/minecaptcha` | 2 | 200 |
+| GPL-3.0 | `China2B2T/Captcha`, `irootdev/AnBot`, `jonesdevelopment/sonar` | 5 | 500 |
+| MIT | `FeelingAlive0/AdvancedCaptcha`, `InstantlyMoist/Captcha`, `JSH32/Minecaptcha`, `Joey61021/captcha`, `LagBug/XProtect`, `Mrbysco/Captcha`, `Z4OLLIEZ4/reCaptcha`, `haq/mapcha`, `just-captcha/ProstoCaptcha`, `laforetbrut/are-you-sure`, `n1zamu/NCaptcha` | 23 | 2300 |
+| all rights reserved (Modrinth) | `CaptchaVerifyZ` | 1 | 100 |
+| no licence (all rights reserved) | `Archy-X/Krypton`, `Yukun99/Captchas` | 3 | 300 |
+| no licence file (all rights reserved) | `CaptchaGUI`, `ringoame196-s-mcPlugin/ReproductionCAPTCHA` | 2 | 200 |
+| не установлена (см. source в labels.jsonl) | `GalleryCaptcha` | 5 | 500 |
+
+## The plugins, one by one
+
+| плагин | типов | PNG | лицензия | режим |
+|---|---|---|---|---|
+| `Archy-X/Krypton` | 2 | 200 | no licence (all rights reserved) | clean-room |
+| `BotFilter` | 1 | 100 | BSD-2-Clause + запрет на коммерческий хостинг | clean-room |
+| `CaptchaGUI` | 1 | 100 | no licence file (all rights reserved) | clean-room |
+| `CaptchaVerifyZ` | 1 | 100 | all rights reserved (Modrinth) | clean-room |
+| `China2B2T/Captcha` | 1 | 100 | GPL-3.0 | clean-room |
+| `FeelingAlive0/AdvancedCaptcha` | 2 | 200 | MIT | faithful |
+| `GalleryCaptcha` | 5 | 500 | не установлена (см. source в labels.jsonl) | reconstructed |
+| `InstantlyMoist/Captcha` | 1 | 100 | MIT | faithful |
+| `JSH32/Minecaptcha` | 1 | 100 | MIT | faithful |
+| `Joey61021/captcha` | 1 | 100 | MIT | faithful |
+| `LagBug/XProtect` | 12 | 1200 | MIT | faithful |
+| `LimboFilter` | 4 | 400 | AGPL-3.0 | clean-room |
+| `Mrbysco/Captcha` | 1 | 100 | MIT | faithful |
+| `Yukun99/Captchas` | 1 | 100 | no licence (all rights reserved) | clean-room |
+| `Z4OLLIEZ4/reCaptcha` | 1 | 100 | MIT | faithful |
+| `haq/mapcha` | 1 | 100 | MIT | faithful |
+| `irootdev/AnBot` | 1 | 100 | GPL-3.0 | clean-room |
+| `jSdCool/minecaptcha` | 2 | 200 | CC0-1.0 | faithful |
+| `jonesdevelopment/sonar` | 3 | 300 | GPL-3.0 | clean-room |
+| `just-captcha/ProstoCaptcha` | 1 | 100 | MIT | faithful |
+| `laforetbrut/are-you-sure` | 1 | 100 | MIT | faithful |
+| `n1zamu/NCaptcha` | 1 | 100 | MIT | faithful |
+| `ringoame196-s-mcPlugin/ReproductionCAPTCHA` | 1 | 100 | no licence file (all rights reserved) | clean-room |
+
+## What each licence means for you
+
+* **MIT, Apache-2.0, BSD-2-Clause, CC0-1.0** — you may use, modify and redistribute the rows of
+  those types. Keep the copyright notice and the licence text of the upstream project.
+* **GPL-3.0** (the `jonesdevelopment/sonar`, `China2B2T/Captcha` and `irootdev/AnBot` families) —
+  the rows of those types are published under the copyleft of the upstream plugin. If you
+  redistribute them, the GPL-3.0 terms of that plugin apply to what you distribute.
+* **AGPL-3.0** (`LimboFilter`) — the strongest obligation of the set. The renders of those types
+  reproduce the upstream algorithm, and a clean-room rewrite of the algorithm does not by itself
+  remove the upstream licence: the AGPL-3.0 terms of the upstream plugin apply to those rows, and
+  the upstream notice must be preserved. The upstream project is
+  <https://github.com/Elytrium/LimboFilter> (© Elytrium, AGPL-3.0).
+* **BSD-2-Clause plus an explicit ban on commercial hosting** (`BotFilter`) — the additional
+  restriction of the upstream plugin applies to that type: it may not be used to run a commercial
+  captcha-solving service.
+* **No licence file / all rights reserved** — for those plugins the upstream author granted no
+  permission at all. Those rows (`Archy-X/Krypton`, `CaptchaGUI`, `CaptchaVerifyZ`, `GalleryCaptcha`, `Yukun99/Captchas`, `ringoame196-s-mcPlugin/ReproductionCAPTCHA`) are published for research use; the upstream author granted nothing, so no permission can be derived from this repository — ask the upstream author before any other use.
+
+**`LimboFilter`**: the renders of these types reproduce the upstream algorithm, so the AGPL-3.0 terms of the upstream plugin apply to those rows — including the requirement to offer the corresponding source to users of a network service. The upstream notice must be kept.
+
+## The generator code is under a separate licence
+
+The **data** in this repository is licensed as described above. The **generator code** of the
+project that produced it is under its own licence, in the project repository — the two are not
+the same thing, and the dataset card does not claim otherwise.
+
+## What this file is, and what it is not
+
+* It **is** the per-plugin licence breakdown of this dataset, computed from `labels.jsonl` by the
+  project's publishing tool (`tools/publish_hf.py`) at upload time — the table is not typed by
+  hand and cannot silently disagree with the data.
+* It **is not** a licence grant by the authors of the upstream plugins, and it does not replace
+  their terms. Where they granted nothing, this file says so plainly instead of inventing a
+  licence.
+
+A user of this dataset must comply with the licence of the plugin each row came from.