The first letter indicates the storage format. Normally, it is B for Blu-ray disc format. Other formats may include S = DVD. The second letter indicates if the game is first party (C = Sony), or licensed from third party (L = others). The third letter indicates: A=Asia, J=Japan, U=United States, or E=Europe. The last letter indicates the type: D = Demo, S = Game, M = ?. Note that for some third pa