docs/licensing.md

Copyright, Licensing, and Text-Reuse Policy (UnsolvedAstronomy)

• Metadata & Original Paraphrases: Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0).
• Source Rights Preservation: Every source in sources/registry.jsonl and source_registry.json preserves its own copyright and license (source_license, reuse_mode).
• Paraphrase Policy: Records with reuse_mode = "paraphrase_only" or "metadata_only" withhold verbatim source quotes (original_statement = "" / null) and publish only original normalized formulations with full bibliographic citations and stable identifiers (DOI, arXiv, ADS bibcode).