to access the MusicBrainz audio CD database with Perl.
"During 1999 and 2000, however, the CDDB (after its acquisition by Gracenote) moved from an open position (with GPLed downloads of its data files) to a proprietary one. During this time it stopped access to clients speaking the first version of the CDDB protocol, and instead moved to licensing -- at some cost -- CDDB2 clients, and stopped offering downloads of its data.
However, a few projects started up, taking advantage of the data that had been freely available until this point. One of these was FreeDB, which quickly established an open replacement for the CDDB. The other is MusicBrainz, which is much more interesting.
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