DADC have used the DID-code series DIDC and DIDP for classical (C) and popular (P) recordings released on record labels that were affiliated with Sony. The three other series that are known are DIDX, DIDY and DIDZ: they were used for recordings released on non-Sony affiliated record labels.
As far as Target CDs are concerned, it appears that all CDs made in the USA by DADC for Columbia House Record Club have a DIDX-code in the matrix number, but show a DIDY-code on the disc.
|Matrix : DIDX 002839 / Disc : DIDY 002839
|Matrix : DIDX-2740 / Disc : DIDY 2740
Target CDs that were made in Japan and manufactured by Sony, can be found with a DIDZ-code, both in the matrix number and on the disc.
|Matrix : DIDZ 10045 / Disc : DIDZ 10045