Press: Digital Public Library of America recommends CC0

"The vision of the DPLA is to provide one click access to many different resource types, with the initial focus on producing a resource that gives full text access to books in public domain, e.g. from Hathi Trust, the Internet Archive, and U.S and international research libraries. In order to create a true complete collection of available content and data, it is important that the DPLA makes its data interoperable with other datasets from initiatives and institutions all over the world. To make this work, the various datasets have to be compliant, both legally and technically."