# Rights and licenses

Original text: CC0 1.0. This covers the 36 units inherited from the earlier course draft and the 20 added lessons. The source files and license routes of the added lessons are identified in `course.json`.

External works appear as citations, mathematical antecedents or comparison readings. Their source files, scans, OCR and proof text are not included in this public course. They retain their own licenses and rights.

The authorship notice is in [Title page](TITLE_PAGE.md), and the CC0 1.0 text is in [LICENSE-CC0.txt](LICENSE-CC0.txt). Machine-readable per-unit routes and exact source identities accompany the local course audit.