# Rights and licenses

Original course text is dedicated to the public domain under CC0 1.0. This covers all 56 lessons and the four editorial supplements. Their source files and reading routes are identified in the [lesson and supplement index](../readings.json); file identities are recorded in the [source manifest](../source-edition.json).

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

See the [authorship notice](TITLE_PAGE.md), [authorship and sources](HISTORY.md), and the [CC0 1.0 text](LICENSE-CC0.txt).