Freedb

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Freedb was a database of user-submitted compact disc track listings, where all the content was under the GNU General Public License. To look up CD information over the Internet, a client program calculated a hash function from the CD table of contents and used it as a disc ID to query the database. If the disc was in the database, the client was able to retrieve and display the artist, album title, track list and some additional information. Freedb was launched in 2001 based on the CDDB (Compact Disc DataBase) after it had been changed to a proprietary license and renamed "Gracenote". As of 24 April 2006, the Freedb database held just under 2,000,000 CDs. As of 2007, MusicBrainz – a project with similar goals – had a Freedb gateway that allowed access to their own database. The Freedb gateway was shut down on March 18, 2019. In 2020, Freedb was shut down by Magix, a German company that had acquired it in 2006. The original software behind CDDB was released under the GNU General Public License, and many people submitted CD information thinking the service would also remain free. The license was later changed, however, and some programmers complained that the new license included certain terms that they couldn't accept: if one wanted to access CDDB, one was not allowed to access any other CDDB-like database (such as Freedb), and any programs using a CDDB lookup had to display a CDDB logo while performing the lookup.