Digital Compact Cassette
From Just Solve the File Format Problem
Digital Compact Cassette (DCC) was an unsuccessful physical audio format. Similarly to Digital Audio Tape (DAT), released around the same time, it was a digital format, but in a case similar to a standard Audio Cassette (the analog Compact Cassette that had been used for decades at that point). The size similarity allowed decks to be built that could play both analog and digital cassettes. As is typical for digital formats of the time promoted by the music industry, there was copy protection built in.
