Public Domain Works has announced that it will partner with the Open Library, sharing its data about works that are in public domain. Public Domain Works supports the Public Domain Works DB, which is now in beta form.
Here's an excerpt from the announcement:
The plan looks to be to upload the Public Domain Works data to the Open Library, and to use read/write APIs to continue to develop different front-ends for different jurisdictions—each with its own algorithms to determine which works are in the public domain.
