arrange/testdata/attribution.md

lenna.png:

By Original full portrait: "Playmate of the Month". Playboy Magazine. November 1972, photographed by Dwight Hooker.This 512x512 electronic/mechanical scan of a section of the full portrait: Alexander Sawchuk and two others[1] - The USC-SIPI image database, Fair use, https://en.wikipedia.org/w/index.php?curid=20658476

valid.jpg

By No machine-readable author provided. Webber assumed (based on copyright claims). [Public domain], via Wikimedia Commons