From the OpenGLAM Blog by Lieke Ploeger:
Starting from 1 January 2014, approximately 95% of all metadata of the DNB [German National Library] is under an open license [CC0].
This includes all 10 million authority records, all 1.5 million records for digital publications, all 500.000 records for serials and about 8 million further title records. The only data which is not yet freely available is the metadata of printed monographs, cards, music sheets and music recordings from the years 2013 and 2014 in MARC 21 and an extended csv-title-pro format. In all other formats, including RDF and CSV, the complete metadata is already open. The DNB plans to publish the complete metadata sets under the CC0 license on 1 July 2015.
Read the Complete Blog Post
Note: Earlier this week we posted about a large amount of descriptive metadata from the National Library of France that became open on January 1, 2014.