From 0a3f7c37c74986d53784e47027cec74bbf37eaa0 Mon Sep 17 00:00:00 2001
From: MetalliC <0vetal0@gmail.com>
Date: Sat, 2 Apr 2016 14:37:30 +0300
Subject: [PATCH] naomi.c: add Derby Owners II protection key [MetalliC]

---
 src/mame/drivers/naomi.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/mame/drivers/naomi.cpp b/src/mame/drivers/naomi.cpp
index 4bab602d1bc..7468d09168e 100644
--- a/src/mame/drivers/naomi.cpp
+++ b/src/mame/drivers/naomi.cpp
@@ -3653,8 +3653,8 @@ ROM_START( derbyoc2 )
 	ROM_LOAD( "mpr-22304.ic10", 0x9800000, 0x1000000, CRC(46c1fb1f) SHA1(6daca76a75df3501f77e473eb065d48804fcc64a) )
 	ROM_LOAD( "mpr-22305.ic11", 0xa800000, 0x1000000, CRC(027d0e7b) SHA1(e3c874e60cabb6f9ce686696d9055a0c0d5289ae) )
 
-	// 840-0083-01    2001     317-0327-JPN   Naomi (label comes from unclear photo, can be wrong)
-	ROM_PARAMETER( ":rom_board:segam2crypt:key", "-1") // key is unknown, probably not used by game
+	// 840-0083-01    2001     317-0327-JPN   Naomi
+	ROM_PARAMETER( ":rom_board:segam2crypt:key", "2a436bb7")
 ROM_END
 
 /*