diff --git a/DATA-LICENSES.md b/DATA-LICENSES.md
new file mode 100644
index 0000000..c514066
--- /dev/null
+++ b/DATA-LICENSES.md
@@ -0,0 +1,18 @@
+# Data licenses
+
+Every shipped dataset, its source, its licence and the attribution it asks for. A
+`data-import/` script rebuilds each sourced table; a curated one is hand-written.
+
+| Table | Source | Licence | Attribution | Rebuild |
+|-------|--------|---------|-------------|---------|
+| `misc/country.tsv` | [datasets/country-codes](https://github.com/datasets/country-codes) | [PDDL 1.0](https://opendatacommons.org/licenses/pddl/1-0/) | none required | `data-import/country.py` |
+| `misc/currency.tsv` | [datasets/currency-codes](https://github.com/datasets/currency-codes); symbols from [Unicode CLDR](https://github.com/unicode-org/cldr) `en.xml` and `root.xml` | PDDL 1.0; [Unicode License v3](https://www.unicode.org/license.txt) | CLDR: "Copyright © 1991-2025 Unicode, Inc. Unicode and the Unicode Logo are registered trademarks of Unicode, Inc. in the United States and other countries." | `data-import/currency.py` |
+| `misc/httpstatus.tsv` | curated (IANA HTTP status codes are facts) | — | — | — |
+| `misc/language.tsv` | curated (ISO 639-1 codes are facts) | — | — | — |
+| `misc/mimetype.tsv` | curated (IANA media types are facts) | — | — | — |
+
+Every other category is hand-written JSON under [`data/`](data), MIT like the code.
+
+```sh
+docker compose run --rm --user "$(id -u):$(id -g)" data-import data-import/country.py
+```
diff --git a/compose.yaml b/compose.yaml
index ca3af11..1d19a46 100644
--- a/compose.yaml
+++ b/compose.yaml
@@ -64,5 +64,13 @@ services:
     <<: *go
     command: sh
 
+  # Rebuilds a shipped TSV from its source: docker compose run --rm data-import data-import/country.py
+  data-import:
+    image: python:3.14.7-slim
+    working_dir: /app
+    volumes:
+      - .:/app
+    entrypoint: python3
+
 volumes:
   gocache:
diff --git a/data-import/country.py b/data-import/country.py
new file mode 100644
index 0000000..326ab57
--- /dev/null
+++ b/data-import/country.py
@@ -0,0 +1,81 @@
+#!/usr/bin/env python3
+"""Rebuild data/misc/country.tsv from datasets/country-codes (PDDL).
+
+    data-import/country.py [--source URL_OR_FILE] [--out FILE]
+"""
+import argparse
+import csv
+import io
+import re
+import sys
+import urllib.request
+from pathlib import Path
+
+SOURCE = "https://raw.githubusercontent.com/datasets/country-codes/main/data/country-codes.csv"
+OUT = Path(__file__).resolve().parent.parent / "data" / "misc" / "country.tsv"
+COLUMNS = ["alpha2", "alpha3", "calling-code", "capital", "currency", "flag", "languages", "name", "numeric", "tld"]
+# Gaps in the source, keyed by alpha2.
+FIXUPS = {"TR": {"currency": "TRY"}}
+
+
+def read(source):
+    if re.match(r"^https?://", source):
+        with urllib.request.urlopen(source, timeout=60) as r:
+            return r.read().decode("utf-8")
+    return Path(source).read_text(encoding="utf-8")
+
+
+def flag(alpha2):
+    return "".join(chr(0x1F1E6 + ord(c) - ord("A")) for c in alpha2)
+
+
+def calling_code(dial):
+    first = re.sub(r"[^0-9-]", "", dial.split(",")[0])
+    return first if re.match(r"^\d+-\d{3}$", first) else first.split("-")[0]
+
+
+def languages(field):
+    return ",".join(p for p in field.split(",") if p)
+
+
+def rows(text):
+    for r in csv.DictReader(io.StringIO(text)):
+        alpha2 = r["ISO3166-1-Alpha-2"]
+        row = {
+            "alpha2": alpha2,
+            "alpha3": r["ISO3166-1-Alpha-3"],
+            "calling-code": calling_code(r["Dial"]),
+            "capital": r["Capital"],
+            "currency": r["ISO4217-currency_alphabetic_code"].split(",")[0],
+            "flag": flag(alpha2),
+            "languages": languages(r["Languages"]),
+            "name": r["CLDR display name"] or r["official_name_en"],
+            "numeric": r["ISO3166-1-numeric"].zfill(3),
+            "tld": r["TLD"],
+        }
+        row.update(FIXUPS.get(alpha2, {}))
+        if all(row[c] for c in ("alpha2", "alpha3", "calling-code", "capital", "currency", "name", "tld")):
+            yield row
+
+
+def write(out, table):
+    lines = ["\t".join(COLUMNS)]
+    for row in sorted(table, key=lambda r: r["alpha2"]):
+        cells = [row[c] for c in COLUMNS]
+        assert not any("\t" in c or "\n" in c for c in cells), row
+        lines.append("\t".join(cells))
+    Path(out).write_text("\n".join(lines) + "\n", encoding="utf-8")
+    return len(lines) - 1
+
+
+def main():
+    p = argparse.ArgumentParser(description=__doc__.splitlines()[0])
+    p.add_argument("--source", default=SOURCE)
+    p.add_argument("--out", default=str(OUT))
+    a = p.parse_args()
+    n = write(a.out, rows(read(a.source)))
+    print(f"{a.out}: {n} rows", file=sys.stderr)
+
+
+if __name__ == "__main__":
+    main()
diff --git a/data-import/currency.py b/data-import/currency.py
new file mode 100644
index 0000000..9389e3e
--- /dev/null
+++ b/data-import/currency.py
@@ -0,0 +1,82 @@
+#!/usr/bin/env python3
+"""Rebuild data/misc/currency.tsv from datasets/currency-codes (PDDL) and CLDR's symbols (Unicode).
+
+    data-import/currency.py [--source URL_OR_FILE] [--symbols URL_OR_FILE ...] [--out FILE]
+
+The symbols come from the first locale file that has one, narrow symbols before wide.
+"""
+import argparse
+import csv
+import io
+import re
+import sys
+import urllib.request
+import xml.etree.ElementTree as ET
+from pathlib import Path
+
+SOURCE = "https://raw.githubusercontent.com/datasets/currency-codes/main/data/codes-all.csv"
+SYMBOLS = [
+    "https://raw.githubusercontent.com/unicode-org/cldr/main/common/main/en.xml",
+    "https://raw.githubusercontent.com/unicode-org/cldr/main/common/main/root.xml",
+]
+OUT = Path(__file__).resolve().parent.parent / "data" / "misc" / "currency.tsv"
+COLUMNS = ["code", "decimals", "name", "numeric", "symbol"]
+
+
+def read(source):
+    if re.match(r"^https?://", source):
+        with urllib.request.urlopen(source, timeout=60) as r:
+            return r.read().decode("utf-8")
+    return Path(source).read_text(encoding="utf-8")
+
+
+def symbols(xml_texts):
+    """CLDR's symbol per code: the first locale's narrow symbol, else the first locale's wide one."""
+    narrow, wide = {}, {}
+    for text in xml_texts:
+        for c in ET.fromstring(text).iter("currency"):
+            for s in c.findall("symbol"):
+                into = narrow if s.get("alt") == "narrow" else wide if s.get("alt") is None else None
+                if into is not None:
+                    into.setdefault(c.get("type"), s.text)
+    return {**wide, **narrow}
+
+
+def rows(text, symbol):
+    seen = set()
+    for r in csv.DictReader(io.StringIO(text)):
+        code = r["AlphabeticCode"]
+        if not code or code in seen or r["WithdrawalDate"] or r["Entity"].startswith("ZZ"):
+            continue
+        seen.add(code)
+        yield {
+            "code": code,
+            "decimals": r["MinorUnit"],
+            "name": r["Currency"],
+            "numeric": r["NumericCode"].zfill(3),
+            "symbol": symbol.get(code, code),
+        }
+
+
+def write(out, table):
+    lines = ["\t".join(COLUMNS)]
+    for row in sorted(table, key=lambda r: r["code"]):
+        cells = [row[c] for c in COLUMNS]
+        assert all(cells) and not any("\t" in c or "\n" in c for c in cells), row
+        lines.append("\t".join(cells))
+    Path(out).write_text("\n".join(lines) + "\n", encoding="utf-8")
+    return len(lines) - 1
+
+
+def main():
+    p = argparse.ArgumentParser(description=__doc__.splitlines()[0])
+    p.add_argument("--source", default=SOURCE)
+    p.add_argument("--symbols", nargs="+", default=SYMBOLS)
+    p.add_argument("--out", default=str(OUT))
+    a = p.parse_args()
+    n = write(a.out, rows(read(a.source), symbols(read(s) for s in a.symbols)))
+    print(f"{a.out}: {n} rows", file=sys.stderr)
+
+
+if __name__ == "__main__":
+    main()