US federal government works are generally public domain — OPEN Government Data Act (P.L. 115-435) + 17 U.S.C. §105; agencies encouraged to use CC0

Summary

Claim: US federal government works are generally public domain (OPEN Government Data Act, P.L. 115-435; 17 U.S.C. §105); agencies are encouraged to use CC0.

Source: https://resources.data.gov/open-licenses/

Confidence: Verified.

Why this matters for Candid: US federal data (FRED, Census) is the lowest-friction class of open data — no attribution required, no share-alike obligation. Contrast with OpenStreetMap uses the Open Database License (ODbL) — attribution + share-alike on derivative databases; "produced works" (rendered maps) can be licensed freely for the share-alike case.