The Pre-Master Compact Disc (PMCD) was developed by Sonic Solutions and Sony and is specified in the Red Book as a replication master.
A PMCD is a mastering format that contains the ISRC codes, International Standard Recording Code (ISRC), for processing and for authenticationPQ codes in the credits. Therefore, PMCDs can only be created by a fewCD recorders. Before it is used to create the glass master, it can be played on normal CD players. Some CD manufacturers require printouts of the PQ codes in addition to the PMCD for content authenticity.