diff --git a/src/mame/drivers/goindol.c b/src/mame/drivers/goindol.c
index 998100b6a75..7dbba538d6f 100644
--- a/src/mame/drivers/goindol.c
+++ b/src/mame/drivers/goindol.c
@@ -1,4 +1,4 @@
-// license:???
+// license:BSD-3-Clause
 // copyright-holders:Jarek Parchanski
 /***************************************************************************
   GOINDOL
diff --git a/src/mame/drivers/gsword.c b/src/mame/drivers/gsword.c
index 52f91c44223..50ae7998a2c 100644
--- a/src/mame/drivers/gsword.c
+++ b/src/mame/drivers/gsword.c
@@ -1,4 +1,4 @@
-// license:???
+// license:BSD-3-Clause
 // copyright-holders:Steve Ellenoff,Jarek Parchanski
 /*
     Great Swordsman (Taito) 1984
diff --git a/src/mame/drivers/psychic5.c b/src/mame/drivers/psychic5.c
index f32d013cda5..c4201cd0c01 100644
--- a/src/mame/drivers/psychic5.c
+++ b/src/mame/drivers/psychic5.c
@@ -1,4 +1,4 @@
-// license:???
+// license:BSD-3-Clause
 // copyright-holders:Jarek Parchanski
 /**************************
  *** PSYCHIC 5 hardware ***     (by Roberto Ventura)
diff --git a/src/mame/drivers/retofinv.c b/src/mame/drivers/retofinv.c
index d6d5b56af8d..7153e7ff8db 100644
--- a/src/mame/drivers/retofinv.c
+++ b/src/mame/drivers/retofinv.c
@@ -1,4 +1,4 @@
-// license:???
+// license:BSD-3-Clause
 // copyright-holders:Jarek Parchanski, Andrea Mazzoleni
 /***************************************************************************
 
diff --git a/src/mame/drivers/system1.c b/src/mame/drivers/system1.c
index e60913a2902..e21fa0d4987 100644
--- a/src/mame/drivers/system1.c
+++ b/src/mame/drivers/system1.c
@@ -1,4 +1,4 @@
-// license:???
+// license:BSD-3-Clause
 // copyright-holders:Jarek Parchanski, Nicola Salmoria, Mirko Buffoni
 /******************************************************************************
 
diff --git a/src/mame/drivers/toki.c b/src/mame/drivers/toki.c
index 514fd4ba180..fc6d7cdf076 100644
--- a/src/mame/drivers/toki.c
+++ b/src/mame/drivers/toki.c
@@ -1,4 +1,4 @@
-// license:???
+// license:BSD-3-Clause
 // copyright-holders:Jarek Parchanski
 /***************************************************************************
 
diff --git a/src/mame/video/system1.c b/src/mame/video/system1.c
index 9e0e18de1ac..8307537f531 100644
--- a/src/mame/video/system1.c
+++ b/src/mame/video/system1.c
@@ -1,5 +1,5 @@
-// license:???
-// copyright-holders:???
+// license:BSD-3-Clause
+// copyright-holders:Jarek Parchanski,Mirko Buffoni
 /*************************************************************************
 
     System1 / System 2