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A few years ago I took a look at the licenses of records in the Digital Public Libary of America. I thought it might be interesting how things have changed since then, as well as seeing how various hubs contribute to the total.
Overall, the breakdown of licenses seems to be roughly similar to what it was a few years ago. However, the breakdown of individual hubs show more variance. The three state level hubs shown below the main graphic have a much greater percentage of their records in copyright as opposed to the DPLA as a whole. The DPLA in general, has a solid percentage of records without copyright restrictions, for example the National Archives and Record Administration offers nearly two million records without restrictions.
The treemap graphics below show licenses with at least 1000 records in the DPLA corpus, and 250 records or more for the state level hubs, divided into four clusters: those in copyright, those with no copyright restrictions, Creative Commons records and those where copyright is unknown.
Overall, I leaned towards considering records in copyright, unless they were explicitly listed with another license. Some records were removed if the rights statement from the record didn't seem to make sense, but in general, I think the graphics give a solid flavor of what's in the DPLA corpus.
Note: Best viewed on a larger screen On very small screens it's possible that some of the clusters, particularly Creative Commons clusters, will be so small that they won't be visible. Hover over a record to see the full text of a particular license.