Here is the US patent nr. 6304971 called DIGITAL COMPACT DISC PLAYER SECURITY SYSTEM REPRODUCING METHOD AND APPARATUS . It has been patented by Ken Kutaragi (the Father of the PlayStation) and Tetsuya Hirano. There is described the famous Sony wobble groove invention and how the disc security code i...

Looks like it has been dumped from an american console because it has the 'SCEA' string check inside: ROM:48F5 loc_48F5: ; CODE XREF: ROM:4877?J ROM:48F5 lda byte_1D4 ROM:48F8 eor #$FF ROM:48FA ldx byte_1D7 ROM:48FD sta byte_1D0, x ROM:4900 cmp szSCEA, x ; "SCEA" ROM:4903 beq scea_found_49...