These files are exported automatically on a daily base from the Open Data Repository of the Epigraphic Database Heidelberg (EDH: https://edh-www.adw.uni-heidelberg.de/data).
The article "Epigraphic Database Heidelberg – Data Reuse Options" describes the various options of reusing EDH data: https://doi.org/10.11588/heidok.00026599.
All data can be reused under the CC BY_SA 4.0 licence.