diff --git a/COPYING b/COPYING
new file mode 100644
index 0000000..aba9aaa
--- /dev/null
+++ b/COPYING
@@ -0,0 +1,19 @@
+Copyright © 2015-2020 Simon Rozman (simon@rozman.si)
+
+Permission is hereby granted, free of charge, to any person obtaining a
+copy of this software and associated documentation files (the "Software"),
+to deal in the Software without restriction, including without limitation
+the rights to use, copy, modify, merge, publish, distribute, sublicense,
+and/or sell copies of the Software, and to permit persons to whom the
+Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
diff --git a/LockIfOutOfLogonHours/LockIfOutOfLogonHours.cpp b/LockIfOutOfLogonHours/LockIfOutOfLogonHours.cpp
index 3b57bfb..97ba6bf 100644
--- a/LockIfOutOfLogonHours/LockIfOutOfLogonHours.cpp
+++ b/LockIfOutOfLogonHours/LockIfOutOfLogonHours.cpp
@@ -1,10 +1,5 @@
-//////////////////////////////////////////////////////////////////////////////
-//
-// LockIfOutOfLogonHours - Locks current session if user is out of logon hours
-//
-//  Copyright © 2015 Simon Rozman (simon@rozman.si)
-//
-//////////////////////////////////////////////////////////////////////////////
+// SPDX-License-Identifier: MIT
+// Copyright © 2015-2020 Simon Rozman (simon@rozman.si)
 
 #define SECURITY_WIN32
 
diff --git a/LockIfOutOfLogonHours/LockIfOutOfLogonHours.h b/LockIfOutOfLogonHours/LockIfOutOfLogonHours.h
index fd5697d..3040684 100644
--- a/LockIfOutOfLogonHours/LockIfOutOfLogonHours.h
+++ b/LockIfOutOfLogonHours/LockIfOutOfLogonHours.h
@@ -1,10 +1,5 @@
-//////////////////////////////////////////////////////////////////////////////
-//
-// LockIfOutOfLogonHours - Locks current session if user is out of logon hours
-//
-//  Copyright © 2015 Simon Rozman (simon@rozman.si)
-//
-//////////////////////////////////////////////////////////////////////////////
+// SPDX-License-Identifier: MIT
+// Copyright © 2015-2020 Simon Rozman (simon@rozman.si)
 
 #ifndef __LOCK_IF_OUT_OF_LOGON_HOURS_H__
 #define __LOCK_IF_OUT_OF_LOGON_HOURS_H__
diff --git a/LockIfOutOfLogonHours/LockIfOutOfLogonHours.rc b/LockIfOutOfLogonHours/LockIfOutOfLogonHours.rc
index de2e394..50cb0f7 100644
Binary files a/LockIfOutOfLogonHours/LockIfOutOfLogonHours.rc and b/LockIfOutOfLogonHours/LockIfOutOfLogonHours.rc differ