diff --git a/src/mame/drivers/hideseek.c b/src/mame/drivers/hideseek.c
index 4bb990a197d..36d78070dc9 100644
--- a/src/mame/drivers/hideseek.c
+++ b/src/mame/drivers/hideseek.c
@@ -1,4 +1,4 @@
-// license:???
+// license:BSD-3-Clause
 // copyright-holders:Guru
 /* Hide & Seek
 
diff --git a/src/mame/drivers/ichiban.c b/src/mame/drivers/ichiban.c
index 9306da356cb..8a434dbbc88 100644
--- a/src/mame/drivers/ichiban.c
+++ b/src/mame/drivers/ichiban.c
@@ -1,4 +1,4 @@
-// license:???
+// license:BSD-3-Clause
 // copyright-holders:Guru
 /***************************************************************************
 
diff --git a/src/mame/drivers/igspc.c b/src/mame/drivers/igspc.c
index c47dec58542..7846df2687b 100644
--- a/src/mame/drivers/igspc.c
+++ b/src/mame/drivers/igspc.c
@@ -1,4 +1,4 @@
-// license:???
+// license:BSD-3-Clause
 // copyright-holders:David Haywood
 /*
 
diff --git a/src/mame/drivers/pyson.c b/src/mame/drivers/pyson.c
index df2a97d0a01..dfc36d4f31f 100644
--- a/src/mame/drivers/pyson.c
+++ b/src/mame/drivers/pyson.c
@@ -1,4 +1,4 @@
-// license:???
+// license:BSD-3-Clause
 // copyright-holders:Guru, Scott Stone
 /***************************************************************************
 
diff --git a/src/mame/drivers/xtom3d.c b/src/mame/drivers/xtom3d.c
index df6b92ec568..41b2e458248 100644
--- a/src/mame/drivers/xtom3d.c
+++ b/src/mame/drivers/xtom3d.c
@@ -1,4 +1,4 @@
-// license:???
+// license:BSD-3-Clause
 // copyright-holders:Guru
 /***************************************************************************