Sources and licenses

CourtListener / Free Law Project — the full opinion corpus (10,798,326 opinions at the current snapshot) and the citation graph derived from it.

Status stated by the source: bulk data files are “free of known copyright restrictions”, published under the Creative Commons Public Domain Mark 1.0. Source: courtlistener.com/help/api/bulk-data. Every opinion in QuestionToCase links back to its CourtListener page.

State codes — Pile of Law (huggingface.co/datasets/pile-of-law/pile-of-law, state_codes), originally published by Justia. This is the large majority of the statutory material here: 2,698,140 of 3,149,912 primary-law documents (85.7%) carry a law.justia.com provenance URL.

License: Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0). Creator: Pile of Law (Peter Henderson, Mark Krass, Lucia Zheng, Neel Guha, Christopher D. Manning, Dan Jurafsky, Daniel E. Ho; Pile of Law: Learning Responsible Data Filtering from the Law and a 256GB Open-Source Legal Dataset, 2022). The dataset card states that “individual sources may have other licenses” and asks that the data not be re-hosted in a way that can be indexed by search engines; accordingly, QuestionToCase search results are marked noindex and excluded in robots.txt. Modifications: the text is tokenized and indexed for search; sections are displayed with their original provenance link. This material is provided under the same license and is not offered for commercial use.

United States Code — Office of the Law Revision Counsel (uscode.house.gov). 60,411 sections. A work of the United States Government; the OLRC download pages state no separate license.

Code of Federal Regulations — GovInfo / eCFR (ecfr.gov). 227,539 sections. Under 17 U.S.C. § 105 works of the United States Government are not subject to copyright protection; GovInfo asks that “customary credit should be given to the Government department or agency which prepared the material” (govinfo.gov/about/policies). Prepared by the Office of the Federal Register and the Government Publishing Office.

California codes, constitution, and rules of court — leginfo.legislature.ca.gov (162,302 sections) and courts.ca.gov (1,520 rules). Official California sources; their own terms of use apply and are not restated here.