Its original database was created from and continues to receive voluntary contributions from users. A TOC, or Table of Contents, is a list of offsets corresponding to the start of each track on a CD. Because CDs do not contain any digitally-encoded information about their contents, Kan and Scherf devised a technology that identifies and looks up CDs based on TOC information stored at the beginning of each disc. xmcd and CDDB were created by Ti Kan and Steve Scherf. Gracenote began in 1993 as an open-source project involving a CD player program named xmcd and an associated database named CDDB. Formerly CDDB (" Compact Disc Data Base"), Gracenote maintains and licenses an Internet-accessible database containing information about the contents of audio compact discs and vinyl records. is a company owned by Nielsen Holdings that provides music, video and sports metadata and automatic content recognition (ACR) technologies to entertainment services and companies, worldwide.
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