repo: organize Unicode mapping sources and licenses

COPYRIGHT.md

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+# Copyright and licensing
+
+This repository contains two kinds of material.
+
+## Unicode data files
+
+The files under:
+
+- `UCD/`
+- `MAPPINGS/`
+
+are imported from the Unicode Consortium public data directories, including:
+
+- `https://www.unicode.org/Public/17.0.0/ucd/`
+- `https://www.unicode.org/Public/MAPPINGS/`
+
+These files are Unicode Data Files and are covered by the Unicode license terms.
+Do not replace these files with Novell NSS `unitables/*.tab` files.
+
+## MARS-NWE generated/helper files
+
+Repository helper scripts and generated C table glue maintained by the MARS-NWE
+project are licensed as GPL-2.0-only unless a file states otherwise.
+
+The generated tables are derived from the Unicode data files above and are shaped
+for MARS-NWE/libnwcore compatibility, including NSS-compatible symbol names where
+needed.

LICENSES/GPL-2.0-only.txt

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+GNU GENERAL PUBLIC LICENSE
+Version 2, June 1991
+
+This repository uses GPL-2.0-only for MARS-NWE-authored scripts and glue files.
+
+The full GPL-2.0 license text is available from the Free Software Foundation:
+https://www.gnu.org/licenses/old-licenses/gpl-2.0.txt

LICENSES/README.md

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 # Licenses
 
-The `UCD/` directory contains Unicode Character Database 17.0.0 data files.
-See `UCD/ReadMe.txt` and the Unicode terms of use referenced there.
+## Unicode data
 
-Generated files under `TAB/` are derived from those UCD data files and keep the
-same upstream data provenance. MARS-NWE consumes them as generated C data, not
-as copied Novell NSS unitables.
+`UCD/` and `MAPPINGS/` contain Unicode Data Files imported from unicode.org.
+They are covered by the Unicode license terms as published by the Unicode
+Consortium.
+
+The source data should remain clearly separated from generated MARS-NWE output.
+
+## MARS-NWE repository code
+
+Scripts, build glue, generated-output templates, and other project-authored files
+in this repository are GPL-2.0-only unless a file says otherwise.