Source: ttf-ancient-fonts Version: 2.60-1 Severity: important It appears that sometime after January 29, 2018, (according to the Wayback Machine) that ttf-ancient-fonts changed their license to "personal, non-commercial use". That means that the latest version of the fonts are no longer compliant with the DFSG and can't be distributed in Debian main.
https://web.archive.org/web/20180129230141/http://users.teilar.gr/~g1951d/ (Click the blue arrow at the top of the page to see the next snapshot which includes the license change.) Thanks, Jeremy Bicha
