Data license
============

The curated data files under src/athletevalue/data/ (the deal registry, the team
crosswalk and any manifests) are licensed under the Creative Commons Attribution
4.0 International License (CC BY 4.0): https://creativecommons.org/licenses/by/4.0/

Attribute as: "athletevalue contributors, https://github.com/jman4162/athletevalue".

What this license does not cover
--------------------------------

athletevalue downloads third-party data at runtime into a local cache. That data is
not part of this repository, is never redistributed by this project, and keeps its
own terms. The chain of title is described here as far as it is known.

- SportsDataverse release assets (github.com/sportsdataverse/sportsdataverse-data).
  The publishing repository is MIT-licensed. The MIT grant covers SportsDataverse's
  own code and compilation work. The "ncaa_mbb_*" files are derived from
  stats.ncaa.org play-by-play by the producer repository
  sportsdataverse/ncaa-mbb-hoops-data, which carries no license file; stats.ncaa.org
  refuses automated readers and the NCAA's terms of service prohibit scraping and
  commercial exploitation of its content. The "espn_*" files are collected from
  ESPN's public API, which likewise has granted nothing. Raw game facts are generally
  not copyrightable in the United States, so the exposure is contractual rather than
  copyright, but this project cannot settle that question for its users. A
  commercial user should do their own diligence. The cache manifest tags these
  files "ncaa_derived" and "espn_derived", not "mit".
- EADA (ope.ed.gov/athletics): a U.S. federal government work, public domain.
- Bart Torvik team results (barttorvik.com): fetched only to validate outputs. The
  site's robots.txt permits the season CSV files and sets a ten-second crawl delay;
  the package fetches one file per season. Never bundled and never used to fit a
  shipped value.
- Short factual quotations from press and methodology pages, each with a URL and
  date, sit in the assumption registry as the basis for cited constants. They are
  used for the facts they state, not for their expression.

Optional adapters read files that a user supplies from their own authorized
accounts (for example KenPom or the Knight-Newhouse College Athletics Database).
Those files, and anything fitted from them, are not distributed by this project. An
import-linter contract fails the build if fitting code imports those adapters.

Contributions to the deal registry are certified under the Developer Certificate of
Origin (.github/DCO) plus the accuracy and consent terms in CONTRIBUTING.md and
PRIVACY.md.
