Add SPDX-License-Identifier headers

Add SPDX-License-Identifier headers to all substantial source files.
Collapse copyright years.  Add some Emacs configuration for files
where the copyright notice is at the end.  Add a test that every
file has SPDX-License-Identifier.

10 files changed, 13 insertions, 13 deletions

diff --git a/perl/t/object/base.t b/perl/t/object/base.t
index 8fedd64..2126ebf 100755
--- a/perl/t/object/base.t
+++ b/perl/t/object/base.t
@@ -3,10 +3,10 @@
 # Tests for the basic object implementation.
 #
 # Written by Russ Allbery <eagle@eyrie.org>
-# Copyright 2007, 2008, 2011, 2014
+# Copyright 2007-2008, 2011, 2014
 #     The Board of Trustees of the Leland Stanford Junior University
 #
-# See LICENSE for licensing terms.
+# SPDX-License-Identifier: MIT
 
 use strict;
 use warnings;
diff --git a/perl/t/object/duo-ldap.t b/perl/t/object/duo-ldap.t
index 8a00dbb..e2b5d5d 100644
--- a/perl/t/object/duo-ldap.t
+++ b/perl/t/object/duo-ldap.t
@@ -6,7 +6,7 @@
 # Copyright 2014
 #     The Board of Trustees of the Leland Stanford Junior University
 #
-# See LICENSE for licensing terms.
+# SPDX-License-Identifier: MIT
 
 use strict;
 use warnings;
diff --git a/perl/t/object/duo-pam.t b/perl/t/object/duo-pam.t
index 047343e..f0c9e61 100644
--- a/perl/t/object/duo-pam.t
+++ b/perl/t/object/duo-pam.t
@@ -6,7 +6,7 @@
 # Copyright 2014
 #     The Board of Trustees of the Leland Stanford Junior University
 #
-# See LICENSE for licensing terms.
+# SPDX-License-Identifier: MIT
 
 use strict;
 use warnings;
diff --git a/perl/t/object/duo-radius.t b/perl/t/object/duo-radius.t
index 55cbb9d..5532a68 100644
--- a/perl/t/object/duo-radius.t
+++ b/perl/t/object/duo-radius.t
@@ -6,7 +6,7 @@
 # Copyright 2014
 #     The Board of Trustees of the Leland Stanford Junior University
 #
-# See LICENSE for licensing terms.
+# SPDX-License-Identifier: MIT
 
 use strict;
 use warnings;
diff --git a/perl/t/object/duo-rdp.t b/perl/t/object/duo-rdp.t
index 25060ac..52f0613 100644
--- a/perl/t/object/duo-rdp.t
+++ b/perl/t/object/duo-rdp.t
@@ -6,7 +6,7 @@
 # Copyright 2014
 #     The Board of Trustees of the Leland Stanford Junior University
 #
-# See LICENSE for licensing terms.
+# SPDX-License-Identifier: MIT
 
 use strict;
 use warnings;
diff --git a/perl/t/object/duo.t b/perl/t/object/duo.t
index a975597..75b5834 100755
--- a/perl/t/object/duo.t
+++ b/perl/t/object/duo.t
@@ -6,7 +6,7 @@
 # Copyright 2014
 #     The Board of Trustees of the Leland Stanford Junior University
 #
-# See LICENSE for licensing terms.
+# SPDX-License-Identifier: MIT
 
 use strict;
 use warnings;
diff --git a/perl/t/object/file.t b/perl/t/object/file.t
index b7f295a..80173cd 100755
--- a/perl/t/object/file.t
+++ b/perl/t/object/file.t
@@ -6,7 +6,7 @@
 # Copyright 2008, 2014
 #     The Board of Trustees of the Leland Stanford Junior University
 #
-# See LICENSE for licensing terms.
+# SPDX-License-Identifier: MIT
 
 use strict;
 use warnings;
diff --git a/perl/t/object/keytab.t b/perl/t/object/keytab.t
index 111b7d0..dfb96bd 100755
--- a/perl/t/object/keytab.t
+++ b/perl/t/object/keytab.t
@@ -3,10 +3,10 @@
 # Tests for the keytab object implementation.
 #
 # Written by Russ Allbery <eagle@eyrie.org>
-# Copyright 2007, 2008, 2009, 2010, 2013, 2014
+# Copyright 2007-2010, 2013-2014
 #     The Board of Trustees of the Leland Stanford Junior University
 #
-# See LICENSE for licensing terms.
+# SPDX-License-Identifier: MIT
 
 use strict;
 use warnings;
diff --git a/perl/t/object/password.t b/perl/t/object/password.t
index 306d82b..72a818c 100644
--- a/perl/t/object/password.t
+++ b/perl/t/object/password.t
@@ -7,7 +7,7 @@
 # Copyright 2015
 #     The Board of Trustees of the Leland Stanford Junior University
 #
-# See LICENSE for licensing terms.
+# SPDX-License-Identifier: MIT
 
 use strict;
 use warnings;
diff --git a/perl/t/object/wa-keyring.t b/perl/t/object/wa-keyring.t
index 4a3bd48..aa38e9c 100755
--- a/perl/t/object/wa-keyring.t
+++ b/perl/t/object/wa-keyring.t
@@ -3,10 +3,10 @@
 # Tests for the WebAuth keyring object implementation.
 #
 # Written by Russ Allbery <eagle@eyrie.org>
-# Copyright 2013, 2014
+# Copyright 2013-2014
 #     The Board of Trustees of the Leland Stanford Junior University
 #
-# See LICENSE for licensing terms.
+# SPDX-License-Identifier: MIT
 
 use strict;
 use warnings;