docs: move the 1000 Novels rights warning from Excluded to its datasheet

The card listed 1000_novels among the released sources and, at the same time,
in the "Excluded sources" table with a warning that the novels may include
in-copyright works. The source has been released since v0.2.1, so the row
contradicted the source table; the warning itself was correct.

- src/sources.py: drop 1000_novels_corpus_CLARIN-PL from EXCLUDED
- data/1000_novels/1000_novels.md: rights note with the per-text screen
(830 public domain by term, 10 Wolne Lektury public domain, 17 in copyright
under CC BY-SA 3.0, 143 unverified) and the fixes planned for the next release
- src/make_docs.py: README status bullet pointing to that note
- README.md: regenerated with src/make_docs.py (CHANGELOG stub discarded)

Parquet files are unchanged.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

README.md

@@ -244,6 +244,9 @@ Current v0.3 source-ingestion status:
   validation. HPLT packaging is CC0, while underlying crawled web documents can
   carry independent rights; downstream near-dedup and web-content review remain
   recommended before training.
+- `1000_novels`: included since v0.2.1 under the compiled corpus's CC-BY-4.0
+  licence, which does not cover rights in the individual texts; some are in
+  copyright or unverified. See the rights note in its datasheet.
 
 Current review artifacts:
 
@@ -261,7 +264,6 @@ Sources we reviewed and **deliberately left out** — part of the curation:
 |---|---|
 | `open_subtitles_corpus` | Derivative of copyrighted film/TV dialogue; OpenSubtitles uploads largely unlicensed. Same copyright lesson as Danish Gigaword's OpenSubtitles (paper 2508.02271). Not openly licensed. |
 | `europeana_eu_pl_corpus_raw_speakleash` | Aggregated items with mixed per-record rights (PD / CC-BY-NC / rights-reserved). The raw SpeakLeash redistribution is excluded; only a direct rebuild preserving per-record rights metadata may be included. |
-| `1000_novels_corpus_CLARIN-PL` | CC-BY-4.0 label, but 'novels' likely include in-copyright contemporary works; verify titles/years on CLARIN handle 11321/312 before inclusion. |
 | `project_gutenberg_pl_corpus` | Only 31 PL books (4.3MB) — PG is ~99% English; Polish PD literature already covered by wolne_lektury + wikisource (so near-redundant after dedup). Dropped to avoid the PD-in-EU per-work check (PG claims PD-in-US only) for negligible token gain. |
 
 ## Personal & sensitive data

data/1000_novels/1000_novels.md

@@ -13,6 +13,23 @@
 ## Licensing — traceable basis
 The 1000 Novels Corpus is released under Creative Commons Attribution 4.0 International by CLARIN-PL / Wrocław University of Technology, with attribution to the corpus authors and maintainers.
 
+## Rights note (per-text screen, September 2026)
+The CC-BY-4.0 licence covers the corpus as compiled by CLARIN-PL. It cannot license
+third-party rights in the individual novels and translations. A per-text screen of
+the released file found:
+
+| status | texts |
+|---|---:|
+| public domain in Poland by term (author and any translator died by 1955) | 830 |
+| marked public domain by Wolne Lektury | 10 |
+| in copyright; published by Wolne Lektury under CC BY-SA 3.0 | 17 |
+| author or translator could not be verified | 143 |
+
+Releases up to v0.2.5 label all 1,000 texts `CC-BY-4.0`. Before the next release, the
+17 in-copyright texts should be relabelled `CC-BY-SA-3.0` with Wolne Lektury
+attribution or removed, and the 143 unverified texts withheld until their rights are
+established.
+
 ## Provenance
 Pulled from SpeakLeash's public redistribution (`speakleash-ds-pub`, key `1000_novels_corpus_CLARIN-PL`) of the upstream CLARIN-PL source. SpeakLeash credited as intermediate aggregator; upstream license/attribution preserved.
 

src/make_docs.py

@@ -441,6 +441,9 @@ Current v0.3 source-ingestion status:
   validation. HPLT packaging is CC0, while underlying crawled web documents can
   carry independent rights; downstream near-dedup and web-content review remain
   recommended before training.
+- `1000_novels`: included since v0.2.1 under the compiled corpus's CC-BY-4.0
+  licence, which does not cover rights in the individual texts; some are in
+  copyright or unverified. See the rights note in its datasheet.
 
 Current review artifacts:
 

src/sources.py

@@ -464,9 +464,6 @@ EXCLUDED = {
         "per-record rights (PD / CC-BY-NC / rights-reserved). The raw "
         "SpeakLeash redistribution is excluded; only a direct rebuild preserving "
         "per-record rights metadata may be included.",
-    "1000_novels_corpus_CLARIN-PL": "CC-BY-4.0 label, but 'novels' likely include "
-        "in-copyright contemporary works; verify titles/years on CLARIN handle "
-        "11321/312 before inclusion.",
     "project_gutenberg_pl_corpus": "Only 31 PL books (4.3MB) — PG is ~99% English; "
         "Polish PD literature already covered by wolne_lektury + wikisource (so "
         "near-redundant after dedup). Dropped to avoid the PD-in-EU per-work check "