The WikiProject sum of all paintings is a effort to get an item for every notable painting in WikiData. What's the purpose of this? Consider these questions: How many painting did Picasso create? Where are they located? Who owns them?

Wikidata is an open data Wikimedia project. Wikidata items are licensed under CC0 (a public domain-like license). Data can therefore be pulled from Wikidata without attribution. Google has been doing this for a while. Wikipedia & other Wikimedia projects have templates & modules that pull data as well.

https://www.wikidata.org/wiki/Wikidata:WikiProject_sum_of_all_paintings

https://www.wikidata.org/wiki/Wikidata:Data_access